77902868197 has 72 divisors (see below), whose sum is σ = 101019190272. Its totient is φ = 59851249920.

The previous prime is 77902868191. The next prime is 77902868207. The reversal of 77902868197 is 79186820977.

It is a happy number.

It is not a de Polignac number, because 77902868197 - 2³ = 77902868189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77902868191) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 231165613 + ... + 231165949.

Almost surely, 2^77902868197 is an apocalyptic number.

77902868197 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

77902868197 is a deficient number, since it is larger than the sum of its proper divisors (23116322075).

77902868197 is a wasteful number, since it uses less digits than its factorization.

77902868197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 64.

The spelling of 77902868197 in words is "seventy-seven billion, nine hundred two million, eight hundred sixty-eight thousand, one hundred ninety-seven".