1257665325 has 48 divisors (see below), whose sum is σ = 2381752320. Its totient is φ = 573635520.

The previous prime is 1257665317. The next prime is 1257665341. The reversal of 1257665325 is 5235667521.

It is not a de Polignac number, because 1257665325 - 2³ = 1257665317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 253216 + ... + 258134.

It is an arithmetic number, because the mean of its divisors is an integer number (49619840).

Almost surely, 2^1257665325 is an apocalyptic number.

1257665325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1257665325 is a deficient number, since it is larger than the sum of its proper divisors (1124086995).

1257665325 is a wasteful number, since it uses less digits than its factorization.

1257665325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5426 (or 5421 counting only the distinct ones).

The product of its digits is 378000, while the sum is 42.

The square root of 1257665325 is about 35463.5774422153. The cubic root of 1257665325 is about 1079.4147849726.

The spelling of 1257665325 in words is "one billion, two hundred fifty-seven million, six hundred sixty-five thousand, three hundred twenty-five".