1538765731857 has 16 divisors (see below), whose sum is σ = 2064078704448. Its totient is φ = 1019660873280.

The previous prime is 1538765731847. The next prime is 1538765731889. The reversal of 1538765731857 is 7581375678351.

It is not a de Polignac number, because 1538765731857 - 2²⁴ = 1538748954641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1538765731807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1083078 + ... + 2061695.

It is an arithmetic number, because the mean of its divisors is an integer number (129004919028).

Almost surely, 2^{1538765731857} is an apocalyptic number.

It is an amenable number.

1538765731857 is a deficient number, since it is larger than the sum of its proper divisors (525312972591).

1538765731857 is a wasteful number, since it uses less digits than its factorization.

1538765731857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145760.

The product of its digits is 148176000, while the sum is 66.

The spelling of 1538765731857 in words is "one trillion, five hundred thirty-eight billion, seven hundred sixty-five million, seven hundred thirty-one thousand, eight hundred fifty-seven".