77662660570769 has 4 divisors (see below), whose sum is σ = 79761651397044. Its totient is φ = 75563669744496.

The previous prime is 77662660570757. The next prime is 77662660570819. The reversal of 77662660570769 is 96707506626677.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60516932823169 + 17145727747600 = 7779263^2 + 4140740^2 .

It is a cyclic number.

It is not a de Polignac number, because 77662660570769 - 2²⁰ = 77662659522193 is a prime.

It is a super-2 number, since 2×77662660570769² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77662660570696 and 77662660570705.

It is not an unprimeable number, because it can be changed into a prime (77662660570739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1049495413082 + ... + 1049495413155.

It is an arithmetic number, because the mean of its divisors is an integer number (19940412849261).

Almost surely, 2^{77662660570769} is an apocalyptic number.

It is an amenable number.

77662660570769 is a deficient number, since it is larger than the sum of its proper divisors (2098990826275).

77662660570769 is a wasteful number, since it uses less digits than its factorization.

77662660570769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2098990826274.

The product of its (nonzero) digits is 1680315840, while the sum is 74.

The spelling of 77662660570769 in words is "seventy-seven trillion, six hundred sixty-two billion, six hundred sixty million, five hundred seventy thousand, seven hundred sixty-nine".