778988715993 has 24 divisors (see below), whose sum is σ = 1151496265920. Its totient is φ = 507194382240.

The previous prime is 778988715983. The next prime is 778988716031. The reversal of 778988715993 is 399517889877.

It is a happy number.

It is not a de Polignac number, because 778988715993 - 2⁴ = 778988715977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (778988715983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3701428 + ... + 3906218.

It is an arithmetic number, because the mean of its divisors is an integer number (47979011080).

Almost surely, 2^778988715993 is an apocalyptic number.

It is an amenable number.

778988715993 is a deficient number, since it is larger than the sum of its proper divisors (372507549927).

778988715993 is a wasteful number, since it uses less digits than its factorization.

778988715993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214669 (or 214666 counting only the distinct ones).

The product of its digits is 1920360960, while the sum is 81.

The spelling of 778988715993 in words is "seven hundred seventy-eight billion, nine hundred eighty-eight million, seven hundred fifteen thousand, nine hundred ninety-three".