257415781086 has 48 divisors (see below), whose sum is σ = 603538475904. Its totient is φ = 82074593304.

The previous prime is 257415781069. The next prime is 257415781087. The reversal of 257415781086 is 680187514752.

257415781086 is a `hidden beast` number, since 2 + 57 + 4 + 1 + 578 + 10 + 8 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257415781087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11503216 + ... + 11525571.

It is an arithmetic number, because the mean of its divisors is an integer number (12573718248).

Almost surely, 2^257415781086 is an apocalyptic number.

257415781086 is an abundant number, since it is smaller than the sum of its proper divisors (346122694818).

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

257415781086 is a wasteful number, since it uses less digits than its factorization.

257415781086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23028827 (or 23028815 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 54.

The spelling of 257415781086 in words is "two hundred fifty-seven billion, four hundred fifteen million, seven hundred eighty-one thousand, eighty-six".