257139491484 has 24 divisors (see below), whose sum is σ = 600000540048. Its totient is φ = 85711964800.

The previous prime is 257139491471. The next prime is 257139491513. The reversal of 257139491484 is 484194931752.

It is a super-2 number, since 2×257139491484² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1321384 + ... + 1503440.

It is an arithmetic number, because the mean of its divisors is an integer number (25000022502).

Almost surely, 2^257139491484 is an apocalyptic number.

It is an amenable number.

257139491484 is an abundant number, since it is smaller than the sum of its proper divisors (342861048564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257139491484 is a wasteful number, since it uses less digits than its factorization.

257139491484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299765 (or 299763 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 57.

The spelling of 257139491484 in words is "two hundred fifty-seven billion, one hundred thirty-nine million, four hundred ninety-one thousand, four hundred eighty-four".