77554468668 has 12 divisors (see below), whose sum is σ = 180960426920. Its totient is φ = 25851489552.

The previous prime is 77554468601. The next prime is 77554468699. The reversal of 77554468668 is 86686445577.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×77554468668² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77554468599 and 77554468608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3231436183 + ... + 3231436206.

Almost surely, 2^77554468668 is an apocalyptic number.

It is an amenable number.

77554468668 is an abundant number, since it is smaller than the sum of its proper divisors (103405958252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77554468668 is a wasteful number, since it uses less digits than its factorization.

77554468668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462872396 (or 6462872394 counting only the distinct ones).

The product of its digits is 270950400, while the sum is 66.

The spelling of 77554468668 in words is "seventy-seven billion, five hundred fifty-four million, four hundred sixty-eight thousand, six hundred sixty-eight".