521663134422 has 64 divisors (see below), whose sum is σ = 1071130604544. Its totient is φ = 169294778880.

The previous prime is 521663134387. The next prime is 521663134439. The reversal of 521663134422 is 224431366125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47173918 + ... + 47184974.

It is an arithmetic number, because the mean of its divisors is an integer number (16736415696).

Almost surely, 2^521663134422 is an apocalyptic number.

521663134422 is an abundant number, since it is smaller than the sum of its proper divisors (549467470122).

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

521663134422 is a wasteful number, since it uses less digits than its factorization.

521663134422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11973.

The product of its digits is 207360, while the sum is 39.

It can be divided in two parts, 521663 and 134422, that added together give a triangular number (656085 = T₁₁₄₅).

The spelling of 521663134422 in words is "five hundred twenty-one billion, six hundred sixty-three million, one hundred thirty-four thousand, four hundred twenty-two".