256070021761 has 8 divisors (see below), whose sum is σ = 267245542080. Its totient is φ = 244898004912.

The previous prime is 256070021759. The next prime is 256070021783. The reversal of 256070021761 is 167120070652.

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

It is not a de Polignac number, because 256070021761 - 2¹ = 256070021759 is a prime.

It is a super-2 number, since 2×256070021761² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256070021761.

It is not an unprimeable number, because it can be changed into a prime (256070021561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725950 + ... + 1019383.

It is an arithmetic number, because the mean of its divisors is an integer number (33405692760).

Almost surely, 2^256070021761 is an apocalyptic number.

It is an amenable number.

256070021761 is a deficient number, since it is larger than the sum of its proper divisors (11175520319).

256070021761 is a wasteful number, since it uses less digits than its factorization.

256070021761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751735.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 256070021761 in words is "two hundred fifty-six billion, seventy million, twenty-one thousand, seven hundred sixty-one".