256477564222772 has 72 divisors (see below), whose sum is σ = 487674857567520. Its totient is φ = 117963799375360.

The previous prime is 256477564222771. The next prime is 256477564222877. The reversal of 256477564222772 is 277222465774652.

It is a super-2 number, since 2×256477564222772² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (68).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256477564222771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 930947 + ... + 22667637.

It is an arithmetic number, because the mean of its divisors is an integer number (6773261910660).

Almost surely, 2^{256477564222772} is an apocalyptic number.

It is an amenable number.

256477564222772 is a deficient number, since it is larger than the sum of its proper divisors (231197293344748).

256477564222772 is a wasteful number, since it uses less digits than its factorization.

256477564222772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21736961 (or 21736942 counting only the distinct ones).

The product of its digits is 1106380800, while the sum is 68.

The spelling of 256477564222772 in words is "two hundred fifty-six trillion, four hundred seventy-seven billion, five hundred sixty-four million, two hundred twenty-two thousand, seven hundred seventy-two".