249437925657 has 16 divisors (see below), whose sum is σ = 369945132480. Its totient is φ = 166108591296.

The previous prime is 249437925643. The next prime is 249437925661. The reversal of 249437925657 is 756529734942.

249437925657 is a `hidden beast` number, since 2 + 4 + 9 + 4 + 379 + 256 + 5 + 7 = 666.

It is not a de Polignac number, because 249437925657 - 2⁶ = 249437925593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 249437925594 and 249437925603.

It is not an unprimeable number, because it can be changed into a prime (249437925617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5068368 + ... + 5117345.

It is an arithmetic number, because the mean of its divisors is an integer number (23121570780).

Almost surely, 2^249437925657 is an apocalyptic number.

249437925657 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

249437925657 is a deficient number, since it is larger than the sum of its proper divisors (120507206823).

249437925657 is a wasteful number, since it uses less digits than its factorization.

249437925657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10186629 (or 10186623 counting only the distinct ones).

The product of its digits is 114307200, while the sum is 63.

The spelling of 249437925657 in words is "two hundred forty-nine billion, four hundred thirty-seven million, nine hundred twenty-five thousand, six hundred fifty-seven".