256767721122 has 48 divisors (see below), whose sum is σ = 571609825920. Its totient is φ = 76823466720.

The previous prime is 256767721109. The next prime is 256767721181. The reversal of 256767721122 is 221127767652.

It is a happy number.

It is a super-2 number, since 2×256767721122² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2181093 + ... + 2295800.

It is an arithmetic number, because the mean of its divisors is an integer number (11908538040).

Almost surely, 2^256767721122 is an apocalyptic number.

256767721122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

256767721122 is an abundant number, since it is smaller than the sum of its proper divisors (314842104798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256767721122 is a wasteful number, since it uses less digits than its factorization.

256767721122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4476999 (or 4476988 counting only the distinct ones).

The product of its digits is 987840, while the sum is 48.

The spelling of 256767721122 in words is "two hundred fifty-six billion, seven hundred sixty-seven million, seven hundred twenty-one thousand, one hundred twenty-two".