188580879081 has 135 divisors (see below), whose sum is σ = 336134874933. Its totient is φ = 105055937280.

The previous prime is 188580879061. The next prime is 188580879103. The reversal of 188580879081 is 180978085881.

The square root of 188580879081 is 434259.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 170540091225 + 18040787856 = 412965^2 + 134316^2 .

It is not a de Polignac number, because 188580879081 - 2¹³ = 188580870889 is a prime.

It is a super-2 number, since 2×188580879081² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (188580879001) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 1668857281 + ... + 1668857393.

Almost surely, 2^188580879081 is an apocalyptic number.

188580879081 is the 434259-th square number.

188580879081 is the 217130-th centered octagonal number.

It is an amenable number.

188580879081 is a deficient number, since it is larger than the sum of its proper divisors (147553995852).

188580879081 is an frugal number, since it uses more digits than its factorization.

188580879081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 63.

The spelling of 188580879081 in words is "one hundred eighty-eight billion, five hundred eighty million, eight hundred seventy-nine thousand, eighty-one".