257297358378 has 16 divisors (see below), whose sum is σ = 514606218336. Its totient is φ = 85763869200.

The previous prime is 257297358377. The next prime is 257297358391. The reversal of 257297358378 is 873853792752.

It is a super-3 number, since 3×257297358378³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (257297358377) 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, 173401 + ... + 738012.

It is an arithmetic number, because the mean of its divisors is an integer number (32162888646).

Almost surely, 2^257297358378 is an apocalyptic number.

257297358378 is an abundant number, since it is smaller than the sum of its proper divisors (257308859958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257297358378 is a wasteful number, since it uses less digits than its factorization.

257297358378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958469.

The product of its digits is 177811200, while the sum is 66.

The spelling of 257297358378 in words is "two hundred fifty-seven billion, two hundred ninety-seven million, three hundred fifty-eight thousand, three hundred seventy-eight".