257348186864 has 20 divisors (see below), whose sum is σ = 498658240080. Its totient is φ = 128662189440.

The previous prime is 257348186833. The next prime is 257348186873. The reversal of 257348186864 is 468681843752.

It is a junction number, because it is equal to n+sod(n) for n = 257348186797 and 257348186806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564332 + ... + 912779.

It is an arithmetic number, because the mean of its divisors is an integer number (24932912004).

Almost surely, 2^257348186864 is an apocalyptic number.

It is an amenable number.

257348186864 is a deficient number, since it is larger than the sum of its proper divisors (241310053216).

257348186864 is a wasteful number, since it uses less digits than its factorization.

257348186864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488008 (or 1488002 counting only the distinct ones).

The product of its digits is 61931520, while the sum is 62.

The spelling of 257348186864 in words is "two hundred fifty-seven billion, three hundred forty-eight million, one hundred eighty-six thousand, eight hundred sixty-four".