256101121442 has 8 divisors (see below), whose sum is σ = 385119319836. Its totient is φ = 127728014832.

The previous prime is 256101121427. The next prime is 256101121489. The reversal of 256101121442 is 244121101652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 251613595321 + 4487526121 = 501611^2 + 66989^2 .

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

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, 161271953 + ... + 161273540.

Almost surely, 2^256101121442 is an apocalyptic number.

256101121442 is a deficient number, since it is larger than the sum of its proper divisors (129018198394).

256101121442 is a wasteful number, since it uses less digits than its factorization.

256101121442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322545892.

The product of its (nonzero) digits is 3840, while the sum is 29.

The spelling of 256101121442 in words is "two hundred fifty-six billion, one hundred one million, one hundred twenty-one thousand, four hundred forty-two".