97788558861 has 48 divisors (see below), whose sum is σ = 164376808960. Its totient is φ = 54866522880.

The previous prime is 97788558799. The next prime is 97788558863. The reversal of 97788558861 is 16885588779.

97788558861 is a `hidden beast` number, since 9 + 7 + 7 + 8 + 8 + 558 + 8 + 61 = 666.

It is not a de Polignac number, because 97788558861 - 2⁷ = 97788558733 is a prime.

It is a super-2 number, since 2×97788558861² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 97788558861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97788558863) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 846561 + ... + 955113.

Almost surely, 2^97788558861 is an apocalyptic number.

It is an amenable number.

97788558861 is a deficient number, since it is larger than the sum of its proper divisors (66588250099).

97788558861 is a wasteful number, since it uses less digits than its factorization.

97788558861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108826 (or 108823 counting only the distinct ones).

The product of its digits is 270950400, while the sum is 72.

The spelling of 97788558861 in words is "ninety-seven billion, seven hundred eighty-eight million, five hundred fifty-eight thousand, eight hundred sixty-one".