77106639646 has 4 divisors (see below), whose sum is σ = 115659959472. Its totient is φ = 38553319822.

The previous prime is 77106639637. The next prime is 77106639691. The reversal of 77106639646 is 64693660177.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19276659910 + ... + 19276659913.

It is an arithmetic number, because the mean of its divisors is an integer number (28914989868).

Almost surely, 2^77106639646 is an apocalyptic number.

77106639646 is a deficient number, since it is larger than the sum of its proper divisors (38553319826).

77106639646 is a wasteful number, since it uses less digits than its factorization.

77106639646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38553319825.

The product of its (nonzero) digits is 6858432, while the sum is 55.

The spelling of 77106639646 in words is "seventy-seven billion, one hundred six million, six hundred thirty-nine thousand, six hundred forty-six".