191398280680 has 32 divisors (see below), whose sum is σ = 453311719200. Its totient is φ = 72529874496.

The previous prime is 191398280651. The next prime is 191398280683. The reversal of 191398280680 is 86082893191.

It is a super-2 number, since 2×191398280680² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191398280683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125919162 + ... + 125920681.

It is an arithmetic number, because the mean of its divisors is an integer number (14165991225).

Almost surely, 2^191398280680 is an apocalyptic number.

191398280680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191398280680 is an abundant number, since it is smaller than the sum of its proper divisors (261913438520).

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

191398280680 is a wasteful number, since it uses less digits than its factorization.

191398280680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251839873 (or 251839869 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 191398280680 in words is "one hundred ninety-one billion, three hundred ninety-eight million, two hundred eighty thousand, six hundred eighty".