245360724921 has 45 divisors (see below), whose sum is σ = 384336447131. Its totient is φ = 150836669568.

The previous prime is 245360724887. The next prime is 245360724943. The reversal of 245360724921 is 129427063542.

The square root of 245360724921 is 495339.

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

245360724921 is a `hidden beast` number, since 2 + 4 + 536 + 0 + 7 + 24 + 92 + 1 = 666.

It can be written as a sum of positive squares in 7 ways, for example, as 182025956025 + 63334768896 = 426645^2 + 251664^2 .

It is not a de Polignac number, because 245360724921 - 2²⁵ = 245327170489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (245360724971) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 251136385 + ... + 251137361.

Almost surely, 2^245360724921 is an apocalyptic number.

245360724921 is the 495339-th square number.

245360724921 is the 247670-th centered octagonal number.

It is an amenable number.

245360724921 is a deficient number, since it is larger than the sum of its proper divisors (138975722210).

245360724921 is an frugal number, since it uses more digits than its factorization.

245360724921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012 (or 993 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 245360724921 in words is "two hundred forty-five billion, three hundred sixty million, seven hundred twenty-four thousand, nine hundred twenty-one".