257081551380 has 48 divisors (see below), whose sum is σ = 799809272640. Its totient is φ = 68555080224.

The previous prime is 257081551367. The next prime is 257081551393. The reversal of 257081551380 is 83155180752.

257081551380 is a `hidden beast` number, since 2 + 57 + 0 + 8 + 1 + 5 + 513 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (257081551367) and next prime (257081551393).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 238037934 + ... + 238039013.

It is an arithmetic number, because the mean of its divisors is an integer number (16662693180).

Almost surely, 2^257081551380 is an apocalyptic number.

257081551380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257081551380 is an abundant number, since it is smaller than the sum of its proper divisors (542727721260).

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

257081551380 is a wasteful number, since it uses less digits than its factorization.

257081551380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476076965 (or 476076957 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 45.

The spelling of 257081551380 in words is "two hundred fifty-seven billion, eighty-one million, five hundred fifty-one thousand, three hundred eighty".