80657507765 has 4 divisors (see below), whose sum is σ = 96789009324. Its totient is φ = 64526006208.

The previous prime is 80657507737. The next prime is 80657507773. The reversal of 80657507765 is 56770575608.

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 42856038289 + 37801469476 = 207017^2 + 194426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80657507765 is a prime.

It is a super-2 number, since 2×80657507765² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80657507765.

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, 8065750772 + ... + 8065750781.

It is an arithmetic number, because the mean of its divisors is an integer number (24197252331).

Almost surely, 2^80657507765 is an apocalyptic number.

It is an amenable number.

80657507765 is a deficient number, since it is larger than the sum of its proper divisors (16131501559).

80657507765 is a wasteful number, since it uses less digits than its factorization.

80657507765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16131501558.

The product of its (nonzero) digits is 12348000, while the sum is 56.

The spelling of 80657507765 in words is "eighty billion, six hundred fifty-seven million, five hundred seven thousand, seven hundred sixty-five".