20151266634 has 24 divisors (see below), whose sum is σ = 44484873732. Its totient is φ = 6590351040.

The previous prime is 20151266617. The next prime is 20151266671. The reversal of 20151266634 is 43666215102.

It can be written as a sum of positive squares in 2 ways, for example, as 19839567609 + 311699025 = 140853^2 + 17655^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10560507 + ... + 10562414.

Almost surely, 2^20151266634 is an apocalyptic number.

20151266634 is an abundant number, since it is smaller than the sum of its proper divisors (24333607098).

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

20151266634 is a wasteful number, since it uses less digits than its factorization.

20151266634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21122982 (or 21122979 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20151266634 in words is "twenty billion, one hundred fifty-one million, two hundred sixty-six thousand, six hundred thirty-four".