189880137493 has 16 divisors (see below), whose sum is σ = 204988326400. Its totient is φ = 175302474480.

The previous prime is 189880137481. The next prime is 189880137529. The reversal of 189880137493 is 394731088981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189880137493 is a prime.

It is a super-2 number, since 2×189880137493² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189880137893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93958 + ... + 623368.

It is an arithmetic number, because the mean of its divisors is an integer number (12811770400).

Almost surely, 2^189880137493 is an apocalyptic number.

It is an amenable number.

189880137493 is a deficient number, since it is larger than the sum of its proper divisors (15108188907).

189880137493 is a wasteful number, since it uses less digits than its factorization.

189880137493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529912.

The product of its (nonzero) digits is 10450944, while the sum is 61.

The spelling of 189880137493 in words is "one hundred eighty-nine billion, eight hundred eighty million, one hundred thirty-seven thousand, four hundred ninety-three".