257340617642 has 4 divisors (see below), whose sum is σ = 386010926466. Its totient is φ = 128670308820.

The previous prime is 257340617641. The next prime is 257340617797. The reversal of 257340617642 is 246716043752.

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., 252849071281 + 4491546361 = 502841^2 + 67019^2 .

It is not an unprimeable number, because it can be changed into a prime (257340617641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64335154409 + ... + 64335154412.

Almost surely, 2^257340617642 is an apocalyptic number.

257340617642 is a deficient number, since it is larger than the sum of its proper divisors (128670308824).

257340617642 is a wasteful number, since it uses less digits than its factorization.

257340617642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128670308823.

The product of its (nonzero) digits is 1693440, while the sum is 47.

The spelling of 257340617642 in words is "two hundred fifty-seven billion, three hundred forty million, six hundred seventeen thousand, six hundred forty-two".