126521445256 has 16 divisors (see below), whose sum is σ = 242744634000. Its totient is φ = 61789542864.

The previous prime is 126521445241. The next prime is 126521445257. The reversal of 126521445256 is 652544125621.

It is a happy number.

It is a super-2 number, since 2×126521445256² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (126521445257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183897106 + ... + 183897793.

It is an arithmetic number, because the mean of its divisors is an integer number (15171539625).

Almost surely, 2^126521445256 is an apocalyptic number.

It is an amenable number.

126521445256 is a deficient number, since it is larger than the sum of its proper divisors (116223188744).

126521445256 is a wasteful number, since it uses less digits than its factorization.

126521445256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367794948 (or 367794944 counting only the distinct ones).

The product of its digits is 576000, while the sum is 43.

The spelling of 126521445256 in words is "one hundred twenty-six billion, five hundred twenty-one million, four hundred forty-five thousand, two hundred fifty-six".