139899188961 has 63 divisors (see below), whose sum is σ = 244121546721. Its totient is φ = 79901998344.

The previous prime is 139899188941. The next prime is 139899188977. The reversal of 139899188961 is 169881998931.

The square root of 139899188961 is 374031.

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

139899188961 is a `hidden beast` number, since 1 + 398 + 99 + 18 + 89 + 61 = 666.

It is a tau number, because it is divible by the number of its divisors (63).

It is not a de Polignac number, because 139899188961 - 2²¹ = 139897091809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139899188961.

It is not an unprimeable number, because it can be changed into a prime (139899188941) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 70690870 + ... + 70692848.

Almost surely, 2^139899188961 is an apocalyptic number.

139899188961 is the 374031-st square number.

139899188961 is the 187016-th centered octagonal number.

It is an amenable number.

139899188961 is a deficient number, since it is larger than the sum of its proper divisors (104222357760).

139899188961 is an frugal number, since it uses more digits than its factorization.

139899188961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990 (or 1989 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 72.

The spelling of 139899188961 in words is "one hundred thirty-nine billion, eight hundred ninety-nine million, one hundred eighty-eight thousand, nine hundred sixty-one".