77061008642 has 4 divisors (see below), whose sum is σ = 115591512966. Its totient is φ = 38530504320.

The previous prime is 77061008617. The next prime is 77061008671. The reversal of 77061008642 is 24680016077.

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

It can be written as a sum of positive squares in only one way, i.e., 76740634441 + 320374201 = 277021^2 + 17899^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77061008642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19265252159 + ... + 19265252162.

Almost surely, 2^77061008642 is an apocalyptic number.

77061008642 is a deficient number, since it is larger than the sum of its proper divisors (38530504324).

77061008642 is a wasteful number, since it uses less digits than its factorization.

77061008642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38530504323.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 77061008642 in words is "seventy-seven billion, sixty-one million, eight thousand, six hundred forty-two".