1257516865 has 16 divisors (see below), whose sum is σ = 1667047680. Its totient is φ = 902977920.

The previous prime is 1257516859. The next prime is 1257516889. The reversal of 1257516865 is 5686157521.

It is not a de Polignac number, because 1257516865 - 2³ = 1257516857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140364 + ... + 149053.

It is an arithmetic number, because the mean of its divisors is an integer number (104190480).

Almost surely, 2^1257516865 is an apocalyptic number.

It is an amenable number.

1257516865 is a deficient number, since it is larger than the sum of its proper divisors (409530815).

1257516865 is a wasteful number, since it uses less digits than its factorization.

1257516865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289512.

The product of its digits is 504000, while the sum is 46.

The square root of 1257516865 is about 35461.4842469968. The cubic root of 1257516865 is about 1079.3723104441.

The spelling of 1257516865 in words is "one billion, two hundred fifty-seven million, five hundred sixteen thousand, eight hundred sixty-five".