257216906486 has 8 divisors (see below), whose sum is σ = 394034410080. Its totient is φ = 125872103128.

The previous prime is 257216906477. The next prime is 257216906519. The reversal of 257216906486 is 684609612752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1368174941 + ... + 1368175128.

It is an arithmetic number, because the mean of its divisors is an integer number (49254301260).

Almost surely, 2^257216906486 is an apocalyptic number.

257216906486 is a deficient number, since it is larger than the sum of its proper divisors (136817503594).

257216906486 is a wasteful number, since it uses less digits than its factorization.

257216906486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736350118.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 257216906486 in words is "two hundred fifty-seven billion, two hundred sixteen million, nine hundred six thousand, four hundred eighty-six".