661500521107 has 8 divisors (see below), whose sum is σ = 676900301616. Its totient is φ = 646101470112.

The previous prime is 661500521063. The next prime is 661500521117. The reversal of 661500521107 is 701125005166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661500521107 - 2²⁷ = 661366303379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661500521117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1935093 + ... + 2251129.

It is an arithmetic number, because the mean of its divisors is an integer number (84612537702).

Almost surely, 2^661500521107 is an apocalyptic number.

661500521107 is a deficient number, since it is larger than the sum of its proper divisors (15399780509).

661500521107 is a wasteful number, since it uses less digits than its factorization.

661500521107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364757.

The product of its (nonzero) digits is 12600, while the sum is 34.

The spelling of 661500521107 in words is "six hundred sixty-one billion, five hundred million, five hundred twenty-one thousand, one hundred seven".