126521445261 has 16 divisors (see below), whose sum is σ = 169084961600. Its totient is φ = 84152971008.

The previous prime is 126521445257. The next prime is 126521445301. The reversal of 126521445261 is 162544125621.

It is not a de Polignac number, because 126521445261 - 2² = 126521445257 is a prime.

It is a super-2 number, since 2×126521445261² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126521445241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2742195 + ... + 2787951.

It is an arithmetic number, because the mean of its divisors is an integer number (10567810100).

Almost surely, 2^126521445261 is an apocalyptic number.

It is an amenable number.

126521445261 is a deficient number, since it is larger than the sum of its proper divisors (42563516339).

126521445261 is a wasteful number, since it uses less digits than its factorization.

126521445261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47868.

The product of its digits is 115200, while the sum is 39.

The spelling of 126521445261 in words is "one hundred twenty-six billion, five hundred twenty-one million, four hundred forty-five thousand, two hundred sixty-one".