778812999988 has 6 divisors (see below), whose sum is σ = 1362922749986. Its totient is φ = 389406499992.

The previous prime is 778812999983. The next prime is 778813000013. The reversal of 778812999988 is 889999218877.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 587509986064 + 191303013924 = 766492^2 + 437382^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778812999983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97351624995 + ... + 97351625002.

Almost surely, 2^778812999988 is an apocalyptic number.

It is an amenable number.

778812999988 is a deficient number, since it is larger than the sum of its proper divisors (584109749998).

778812999988 is a wasteful number, since it uses less digits than its factorization.

778812999988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194703250001 (or 194703249999 counting only the distinct ones).

The product of its digits is 2633637888, while the sum is 85.

The spelling of 778812999988 in words is "seven hundred seventy-eight billion, eight hundred twelve million, nine hundred ninety-nine thousand, nine hundred eighty-eight".