257322977821 has 8 divisors (see below), whose sum is σ = 316705203584. Its totient is φ = 203596202160.

The previous prime is 257322977819. The next prime is 257322977867. The reversal of 257322977821 is 128779223752.

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

It is not a de Polignac number, because 257322977821 - 2¹ = 257322977819 is a prime.

It is a super-2 number, since 2×257322977821² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257322977881) 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, 1413862425 + ... + 1413862606.

It is an arithmetic number, because the mean of its divisors is an integer number (39588150448).

Almost surely, 2^257322977821 is an apocalyptic number.

It is an amenable number.

257322977821 is a deficient number, since it is larger than the sum of its proper divisors (59382225763).

257322977821 is a wasteful number, since it uses less digits than its factorization.

257322977821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827725051.

The product of its digits is 5927040, while the sum is 55.

The spelling of 257322977821 in words is "two hundred fifty-seven billion, three hundred twenty-two million, nine hundred seventy-seven thousand, eight hundred twenty-one".