249999475457 has 2 divisors, whose sum is σ = 249999475458. Its totient is φ = 249999475456.

The previous prime is 249999475447. The next prime is 249999475469. The reversal of 249999475457 is 754574999942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154389269776 + 95610205681 = 392924^2 + 309209^2 .

It is a cyclic number.

It is not a de Polignac number, because 249999475457 - 2⁴ = 249999475441 is a prime.

It is not a weakly prime, because it can be changed into another prime (249999475447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124999737728 + 124999737729.

It is an arithmetic number, because the mean of its divisors is an integer number (124999737729).

Almost surely, 2^249999475457 is an apocalyptic number.

It is an amenable number.

249999475457 is a deficient number, since it is larger than the sum of its proper divisors (1).

249999475457 is an equidigital number, since it uses as much as digits as its factorization.

249999475457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1028764800, while the sum is 74.

The spelling of 249999475457 in words is "two hundred forty-nine billion, nine hundred ninety-nine million, four hundred seventy-five thousand, four hundred fifty-seven".