778961642675 has 12 divisors (see below), whose sum is σ = 997070903616. Its totient is φ = 603067077600.

The previous prime is 778961642663. The next prime is 778961642681. The reversal of 778961642675 is 576246169877.

It is a happy number.

It is not a de Polignac number, because 778961642675 - 2¹² = 778961638579 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 502555124 + ... + 502556673.

It is an arithmetic number, because the mean of its divisors is an integer number (83089241968).

Almost surely, 2^778961642675 is an apocalyptic number.

778961642675 is a deficient number, since it is larger than the sum of its proper divisors (218109260941).

778961642675 is a wasteful number, since it uses less digits than its factorization.

778961642675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005111838 (or 1005111833 counting only the distinct ones).

The product of its digits is 213373440, while the sum is 68.

The spelling of 778961642675 in words is "seven hundred seventy-eight billion, nine hundred sixty-one million, six hundred forty-two thousand, six hundred seventy-five".