2061915666857 has 4 divisors (see below), whose sum is σ = 2170437544080. Its totient is φ = 1953393789636.

The previous prime is 2061915666827. The next prime is 2061915666887. The reversal of 2061915666857 is 7586665191602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2061915666827) and next prime (2061915666887).

It is a cyclic number.

It is not a de Polignac number, because 2061915666857 - 2⁶ = 2061915666793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2061915666857.

It is not an unprimeable number, because it can be changed into a prime (2061915666827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54260938583 + ... + 54260938620.

It is an arithmetic number, because the mean of its divisors is an integer number (542609386020).

Almost surely, 2^{2061915666857} is an apocalyptic number.

It is an amenable number.

2061915666857 is a deficient number, since it is larger than the sum of its proper divisors (108521877223).

2061915666857 is a wasteful number, since it uses less digits than its factorization.

2061915666857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108521877222.

The product of its (nonzero) digits is 32659200, while the sum is 62.

The spelling of 2061915666857 in words is "two trillion, sixty-one billion, nine hundred fifteen million, six hundred sixty-six thousand, eight hundred fifty-seven".