207080513721 has 9 divisors (see below), whose sum is σ = 299118269541. Its totient is φ = 138052765692.

The previous prime is 207080513711. The next prime is 207080513737. The reversal of 207080513721 is 127315080702.

The square root of 207080513721 is 455061.

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

207080513721 is a `hidden beast` number, since 2 + 0 + 70 + 8 + 0 + 513 + 72 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 207080513721 - 2⁹ = 207080513209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (207080513711) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1289340 + ... + 1441026.

Almost surely, 2^207080513721 is an apocalyptic number.

207080513721 is the 455061-st square number.

207080513721 is the 227531-st centered octagonal number.

It is an amenable number.

207080513721 is a deficient number, since it is larger than the sum of its proper divisors (92037755820).

207080513721 is an frugal number, since it uses more digits than its factorization.

207080513721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303380 (or 151690 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

Multiplying 207080513721 by its sum of digits (36), we get a square (7454898493956 = 2730366²).

It can be divided in two parts, 207080 and 513721, that added together give a square (720801 = 849²).

The spelling of 207080513721 in words is "two hundred seven billion, eighty million, five hundred thirteen thousand, seven hundred twenty-one".