257550213561 has 8 divisors (see below), whose sum is σ = 343418433504. Its totient is φ = 171691068000.

The previous prime is 257550213551. The next prime is 257550213601. The reversal of 257550213561 is 165312055752.

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

It is not a de Polignac number, because 257550213561 - 2³¹ = 255402729913 is a prime.

It is a super-2 number, since 2×257550213561² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257550213511) 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, 2202091 + ... + 2316096.

It is an arithmetic number, because the mean of its divisors is an integer number (42927304188).

Almost surely, 2^257550213561 is an apocalyptic number.

It is an amenable number.

257550213561 is a deficient number, since it is larger than the sum of its proper divisors (85868219943).

257550213561 is a wasteful number, since it uses less digits than its factorization.

257550213561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4537191.

The product of its (nonzero) digits is 315000, while the sum is 42.

The spelling of 257550213561 in words is "two hundred fifty-seven billion, five hundred fifty million, two hundred thirteen thousand, five hundred sixty-one".