257621838157 has 8 divisors (see below), whose sum is σ = 257892365312. Its totient is φ = 257351374800.

The previous prime is 257621838139. The next prime is 257621838167. The reversal of 257621838157 is 751838126752.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257621838157 is a prime.

It is a super-2 number, since 2×257621838157² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257621838098 and 257621838107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257621838167) 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, 16102432 + ... + 16118422.

It is an arithmetic number, because the mean of its divisors is an integer number (32236545664).

Almost surely, 2^257621838157 is an apocalyptic number.

It is an amenable number.

257621838157 is a deficient number, since it is larger than the sum of its proper divisors (270527155).

257621838157 is a wasteful number, since it uses less digits than its factorization.

257621838157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31899.

The product of its digits is 5644800, while the sum is 55.

The spelling of 257621838157 in words is "two hundred fifty-seven billion, six hundred twenty-one million, eight hundred thirty-eight thousand, one hundred fifty-seven".