245597721957 has 24 divisors (see below), whose sum is σ = 429280053696. Its totient is φ = 132086169216.

The previous prime is 245597721931. The next prime is 245597721961. The reversal of 245597721957 is 759127795542.

It is a happy number.

245597721957 is a `hidden beast` number, since 2 + 4 + 559 + 7 + 7 + 21 + 9 + 57 = 666.

It is not a de Polignac number, because 245597721957 - 2¹¹ = 245597719909 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 245597721894 and 245597721903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245597721907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114657063 + ... + 114659204.

It is an arithmetic number, because the mean of its divisors is an integer number (17886668904).

Almost surely, 2^245597721957 is an apocalyptic number.

It is an amenable number.

245597721957 is a deficient number, since it is larger than the sum of its proper divisors (183682331739).

245597721957 is a wasteful number, since it uses less digits than its factorization.

245597721957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229316297 (or 229316294 counting only the distinct ones).

The product of its digits is 55566000, while the sum is 63.

The spelling of 245597721957 in words is "two hundred forty-five billion, five hundred ninety-seven million, seven hundred twenty-one thousand, nine hundred fifty-seven".