512657625442 has 4 divisors (see below), whose sum is σ = 768986438166. Its totient is φ = 256328812720.

The previous prime is 512657625421. The next prime is 512657625479. The reversal of 512657625442 is 244526756215.

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., 485866155681 + 26791469761 = 697041^2 + 163681^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128164406359 + ... + 128164406362.

Almost surely, 2^512657625442 is an apocalyptic number.

512657625442 is a deficient number, since it is larger than the sum of its proper divisors (256328812724).

512657625442 is a wasteful number, since it uses less digits than its factorization.

512657625442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256328812723.

The product of its digits is 4032000, while the sum is 49.

The spelling of 512657625442 in words is "five hundred twelve billion, six hundred fifty-seven million, six hundred twenty-five thousand, four hundred forty-two".