191566552125 has 32 divisors (see below), whose sum is σ = 343287270144. Its totient is φ = 94309684800.

The previous prime is 191566552117. The next prime is 191566552127. The reversal of 191566552125 is 521255665191.

It is not a de Polignac number, because 191566552125 - 2³ = 191566552117 is a prime.

It is a super-3 number, since 3×191566552125³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191566552127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19642977 + ... + 19652726.

It is an arithmetic number, because the mean of its divisors is an integer number (10727727192).

Almost surely, 2^191566552125 is an apocalyptic number.

191566552125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191566552125 is a deficient number, since it is larger than the sum of its proper divisors (151720718019).

191566552125 is a wasteful number, since it uses less digits than its factorization.

191566552125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39295734 (or 39295724 counting only the distinct ones).

The product of its digits is 810000, while the sum is 48.

The spelling of 191566552125 in words is "one hundred ninety-one billion, five hundred sixty-six million, five hundred fifty-two thousand, one hundred twenty-five".