77134307561 has 4 divisors (see below), whose sum is σ = 79794111300. Its totient is φ = 74474503824.

The previous prime is 77134307533. The next prime is 77134307567. The reversal of 77134307561 is 16570343177.

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 24174030400 + 52960277161 = 155480^2 + 230131^2 .

It is a cyclic number.

It is not a de Polignac number, because 77134307561 - 2¹⁴ = 77134291177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77134307567) 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, 1329901826 + ... + 1329901883.

It is an arithmetic number, because the mean of its divisors is an integer number (19948527825).

Almost surely, 2^77134307561 is an apocalyptic number.

It is an amenable number.

77134307561 is a deficient number, since it is larger than the sum of its proper divisors (2659803739).

77134307561 is a wasteful number, since it uses less digits than its factorization.

77134307561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2659803738.

The product of its (nonzero) digits is 370440, while the sum is 44.

The spelling of 77134307561 in words is "seventy-seven billion, one hundred thirty-four million, three hundred seven thousand, five hundred sixty-one".