77607504661 has 8 divisors (see below), whose sum is σ = 82176255000. Its totient is φ = 73039154688.

The previous prime is 77607504649. The next prime is 77607504677. The reversal of 77607504661 is 16640570677.

It can be written as a sum of positive squares in 4 ways, for example, as 28121277636 + 49486227025 = 167694^2 + 222455^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77607504661 - 2⁵ = 77607504629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77607504361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359275 + ... + 533191.

It is an arithmetic number, because the mean of its divisors is an integer number (10272031875).

Almost surely, 2^77607504661 is an apocalyptic number.

It is an amenable number.

77607504661 is a deficient number, since it is larger than the sum of its proper divisors (4568750339).

77607504661 is a wasteful number, since it uses less digits than its factorization.

77607504661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200183.

The product of its (nonzero) digits is 1481760, while the sum is 49.

The spelling of 77607504661 in words is "seventy-seven billion, six hundred seven million, five hundred four thousand, six hundred sixty-one".