256507124117522 has 4 divisors (see below), whose sum is σ = 384760686176286. Its totient is φ = 128253562058760.

The previous prime is 256507124117483. The next prime is 256507124117579. The reversal of 256507124117522 is 225711421705652.

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., 248768317856881 + 7738806260641 = 15772391^2 + 2781871^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64126781029379 + ... + 64126781029382.

Almost surely, 2^{256507124117522} is an apocalyptic number.

256507124117522 is a deficient number, since it is larger than the sum of its proper divisors (128253562058764).

256507124117522 is a wasteful number, since it uses less digits than its factorization.

256507124117522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128253562058763.

The product of its (nonzero) digits is 2352000, while the sum is 50.

The spelling of 256507124117522 in words is "two hundred fifty-six trillion, five hundred seven billion, one hundred twenty-four million, one hundred seventeen thousand, five hundred twenty-two".