191597867802 has 32 divisors (see below), whose sum is σ = 464479680960. Its totient is φ = 58059959760.

The previous prime is 191597867737. The next prime is 191597867831. The reversal of 191597867802 is 208768795191.

It is a super-2 number, since 2×191597867802² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191597867802.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161277073 + ... + 161278260.

It is an arithmetic number, because the mean of its divisors is an integer number (14514990030).

Almost surely, 2^191597867802 is an apocalyptic number.

191597867802 is an abundant number, since it is smaller than the sum of its proper divisors (272881813158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191597867802 is a wasteful number, since it uses less digits than its factorization.

191597867802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322555355 (or 322555349 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 63.

The spelling of 191597867802 in words is "one hundred ninety-one billion, five hundred ninety-seven million, eight hundred sixty-seven thousand, eight hundred two".