12635569434 has 32 divisors (see below), whose sum is σ = 26094104064. Its totient is φ = 4074776640.

The previous prime is 12635569433. The next prime is 12635569451. The reversal of 12635569434 is 43496553621.

It is a super-2 number, since 2×12635569434² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12635569433) 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, 783072 + ... + 799044.

It is an arithmetic number, because the mean of its divisors is an integer number (815440752).

Almost surely, 2^12635569434 is an apocalyptic number.

12635569434 is an abundant number, since it is smaller than the sum of its proper divisors (13458534630).

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

12635569434 is a wasteful number, since it uses less digits than its factorization.

12635569434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20262.

The product of its digits is 2332800, while the sum is 48.

The spelling of 12635569434 in words is "twelve billion, six hundred thirty-five million, five hundred sixty-nine thousand, four hundred thirty-four".