771997902398 has 16 divisors (see below), whose sum is σ = 1188407422176. Its totient is φ = 375984966240.

The previous prime is 771997902373. The next prime is 771997902409. The reversal of 771997902398 is 893209799177.

It is a super-2 number, since 2×771997902398² (a number of 25 digits) contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 30705161 + ... + 30730292.

It is an arithmetic number, because the mean of its divisors is an integer number (74275463886).

Almost surely, 2^771997902398 is an apocalyptic number.

771997902398 is a deficient number, since it is larger than the sum of its proper divisors (416409519778).

771997902398 is a wasteful number, since it uses less digits than its factorization.

771997902398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61435619.

The product of its (nonzero) digits is 108020304, while the sum is 71.

The spelling of 771997902398 in words is "seven hundred seventy-one billion, nine hundred ninety-seven million, nine hundred two thousand, three hundred ninety-eight".