256656551542 has 8 divisors (see below), whose sum is σ = 389310499800. Its totient is φ = 126886384944.

The previous prime is 256656551491. The next prime is 256656551551. The reversal of 256656551542 is 245155656652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 256656551542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720945192 + ... + 720945547.

It is an arithmetic number, because the mean of its divisors is an integer number (48663812475).

Almost surely, 2^256656551542 is an apocalyptic number.

256656551542 is a deficient number, since it is larger than the sum of its proper divisors (132653948258).

256656551542 is a wasteful number, since it uses less digits than its factorization.

256656551542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441890830.

The product of its digits is 10800000, while the sum is 52.

The spelling of 256656551542 in words is "two hundred fifty-six billion, six hundred fifty-six million, five hundred fifty-one thousand, five hundred forty-two".