25457000257 has 8 divisors (see below), whose sum is σ = 27420119720. Its totient is φ = 23494579200.

The previous prime is 25457000243. The next prime is 25457000273. The reversal of 25457000257 is 75200075452.

It can be written as a sum of positive squares in 4 ways, for example, as 10071326736 + 15385673521 = 100356^2 + 124039^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25457000257 - 2²³ = 25448611649 is a prime.

It is the 159553-rd Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25457000297) by changing a digit.

It is a nontrivial repunit in base 159552.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97632 + ... + 245857.

It is an arithmetic number, because the mean of its divisors is an integer number (3427514965).

Almost surely, 2^25457000257 is an apocalyptic number.

It is an amenable number.

25457000257 is a deficient number, since it is larger than the sum of its proper divisors (1963119463).

25457000257 is a wasteful number, since it uses less digits than its factorization.

25457000257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349203.

The product of its (nonzero) digits is 98000, while the sum is 37.

The spelling of 25457000257 in words is "twenty-five billion, four hundred fifty-seven million, two hundred fifty-seven", and thus it is an aban number.