2578788753681 has 32 divisors (see below), whose sum is σ = 4024560365568. Its totient is φ = 1438154657280.

The previous prime is 2578788753637. The next prime is 2578788753733. The reversal of 2578788753681 is 1863578878752.

It is not a de Polignac number, because 2578788753681 - 2²⁶ = 2578721644817 is a prime.

It is a super-2 number, since 2×2578788753681² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2578788753781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3352375 + ... + 4049196.

It is an arithmetic number, because the mean of its divisors is an integer number (125767511424).

Almost surely, 2^{2578788753681} is an apocalyptic number.

2578788753681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2578788753681 is a deficient number, since it is larger than the sum of its proper divisors (1445771611887).

2578788753681 is a wasteful number, since it uses less digits than its factorization.

2578788753681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7401981.

The product of its digits is 1264435200, while the sum is 75.

The spelling of 2578788753681 in words is "two trillion, five hundred seventy-eight billion, seven hundred eighty-eight million, seven hundred fifty-three thousand, six hundred eighty-one".