257127079861 has 8 divisors (see below), whose sum is σ = 270429456384. Its totient is φ = 244137700560.

The previous prime is 257127079849. The next prime is 257127079897. The reversal of 257127079861 is 168970721752.

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

It is a cyclic number.

It is not a de Polignac number, because 257127079861 - 2⁵ = 257127079829 is a prime.

It is a super-2 number, since 2×257127079861² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257127079361) 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, 78247621 + ... + 78250906.

It is an arithmetic number, because the mean of its divisors is an integer number (33803682048).

Almost surely, 2^257127079861 is an apocalyptic number.

It is an amenable number.

257127079861 is a deficient number, since it is larger than the sum of its proper divisors (13302376523).

257127079861 is a wasteful number, since it uses less digits than its factorization.

257127079861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156498611.

The product of its (nonzero) digits is 2963520, while the sum is 55.

The spelling of 257127079861 in words is "two hundred fifty-seven billion, one hundred twenty-seven million, seventy-nine thousand, eight hundred sixty-one".