77665355145 has 96 divisors (see below), whose sum is σ = 159687440640. Its totient is φ = 35473489920.

The previous prime is 77665355143. The next prime is 77665355171. The reversal of 77665355145 is 54155356677.

77665355145 is a `hidden beast` number, since 7 + 7 + 66 + 535 + 5 + 1 + 45 = 666.

It is not a de Polignac number, because 77665355145 - 2¹ = 77665355143 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 77665355091 and 77665355100.

It is not an unprimeable number, because it can be changed into a prime (77665355143) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11980305 + ... + 11986785.

It is an arithmetic number, because the mean of its divisors is an integer number (1663410840).

Almost surely, 2^77665355145 is an apocalyptic number.

It is an amenable number.

77665355145 is an abundant number, since it is smaller than the sum of its proper divisors (82022085495).

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

77665355145 is a wasteful number, since it uses less digits than its factorization.

77665355145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7917 (or 7905 counting only the distinct ones).

The product of its digits is 13230000, while the sum is 54.

The spelling of 77665355145 in words is "seventy-seven billion, six hundred sixty-five million, three hundred fifty-five thousand, one hundred forty-five".