257115015771 has 8 divisors (see below), whose sum is σ = 343428939840. Its totient is φ = 171105551112.

The previous prime is 257115015749. The next prime is 257115015779. The reversal of 257115015771 is 177510511752.

It is a happy number.

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

It is not a de Polignac number, because 257115015771 - 2⁵ = 257115015739 is a prime.

It is a super-2 number, since 2×257115015771² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257115015779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76112881 + ... + 76116258.

It is an arithmetic number, because the mean of its divisors is an integer number (42928617480).

Almost surely, 2^257115015771 is an apocalyptic number.

257115015771 is a deficient number, since it is larger than the sum of its proper divisors (86313924069).

257115015771 is a wasteful number, since it uses less digits than its factorization.

257115015771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152229705.

The product of its (nonzero) digits is 85750, while the sum is 42.

The spelling of 257115015771 in words is "two hundred fifty-seven billion, one hundred fifteen million, fifteen thousand, seven hundred seventy-one".