257162022394 has 4 divisors (see below), whose sum is σ = 385743033594. Its totient is φ = 128581011196.

The previous prime is 257162022391. The next prime is 257162022421. The reversal of 257162022394 is 493220261752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 141808730625 + 115353291769 = 376575^2 + 339637^2 .

It is a super-2 number, since 2×257162022394² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 257162022394.

It is not an unprimeable number, because it can be changed into a prime (257162022391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64290505597 + ... + 64290505600.

Almost surely, 2^257162022394 is an apocalyptic number.

257162022394 is a deficient number, since it is larger than the sum of its proper divisors (128581011200).

257162022394 is a wasteful number, since it uses less digits than its factorization.

257162022394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128581011199.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 257162022394 in words is "two hundred fifty-seven billion, one hundred sixty-two million, twenty-two thousand, three hundred ninety-four".