187326057997521 has 27 divisors (see below), whose sum is σ = 272579737248273. Its totient is φ = 123968753553600.

The previous prime is 187326057997511. The next prime is 187326057997523. The reversal of 187326057997521 is 125799750623781.

It is a happy number.

The square root of 187326057997521 is 13686711.

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

187326057997521 is a `hidden beast` number, since 1 + 8 + 7 + 3 + 2 + 6 + 0 + 5 + 7 + 9 + 97 + 521 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12468702521025 + 174857355476496 = 3531105^2 + 13223364^2 .

It is not a de Polignac number, because 187326057997521 - 2⁵ = 187326057997489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 187326057997521.

It is not an unprimeable number, because it can be changed into a prime (187326057997523) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5625221571 + ... + 5625254871.

Almost surely, 2^{187326057997521} is an apocalyptic number.

187326057997521 is the 13686711-st square number.

187326057997521 is the 6843356-th centered octagonal number.

It is an amenable number.

187326057997521 is a deficient number, since it is larger than the sum of its proper divisors (85253679250752).

187326057997521 is an frugal number, since it uses more digits than its factorization.

187326057997521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66882 (or 33441 counting only the distinct ones).

The product of its (nonzero) digits is 400075200, while the sum is 72.

The spelling of 187326057997521 in words is "one hundred eighty-seven trillion, three hundred twenty-six billion, fifty-seven million, nine hundred ninety-seven thousand, five hundred twenty-one".