97977754685 has 16 divisors (see below), whose sum is σ = 121643832240. Its totient is φ = 75669242880.

The previous prime is 97977754681. The next prime is 97977754691. The reversal of 97977754685 is 58645777979.

It can be written as a sum of positive squares in 8 ways, for example, as 1735722244 + 96242032441 = 41662^2 + 310229^2 .

It is not a de Polignac number, because 97977754685 - 2² = 97977754681 is a prime.

It is a super-2 number, since 2×97977754685² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97977754681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1150949 + ... + 1233141.

It is an arithmetic number, because the mean of its divisors is an integer number (7602739515).

Almost surely, 2^97977754685 is an apocalyptic number.

It is an amenable number.

97977754685 is a deficient number, since it is larger than the sum of its proper divisors (23666077555).

97977754685 is a wasteful number, since it uses less digits than its factorization.

97977754685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90448.

The product of its digits is 933508800, while the sum is 74.

The spelling of 97977754685 in words is "ninety-seven billion, nine hundred seventy-seven million, seven hundred fifty-four thousand, six hundred eighty-five".