77723660642 has 16 divisors (see below), whose sum is σ = 116873004600. Its totient is φ = 38766104832.

The previous prime is 77723660633. The next prime is 77723660669. The reversal of 77723660642 is 24606632777.

It can be written as a sum of positive squares in 4 ways, for example, as 77178951721 + 544708921 = 277811^2 + 23339^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1400234 + ... + 1454682.

Almost surely, 2^77723660642 is an apocalyptic number.

77723660642 is a deficient number, since it is larger than the sum of its proper divisors (39149343958).

77723660642 is a wasteful number, since it uses less digits than its factorization.

77723660642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56197.

The product of its (nonzero) digits is 3556224, while the sum is 50.

The spelling of 77723660642 in words is "seventy-seven billion, seven hundred twenty-three million, six hundred sixty thousand, six hundred forty-two".