2126509656 has 24 divisors (see below), whose sum is σ = 5316838980. Its totient is φ = 708761248.

The previous prime is 2126509639. The next prime is 2126509657. The reversal of 2126509656 is 6569056212.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×2126509656² = 9044086634122476672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2126509657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 221206 + ... + 230618.

Almost surely, 2^2126509656 is an apocalyptic number.

It is an amenable number.

2126509656 is an abundant number, since it is smaller than the sum of its proper divisors (3190329324).

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

2126509656 is an frugal number, since it uses more digits than its factorization.

2126509656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18835 (or 9418 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 2126509656 is about 46114.0938976361. The cubic root of 2126509656 is about 1285.9451742947.

Multiplying 2126509656 by its product of nonzero digits (194400), we get a square (413393477126400 = 20332080²).

The spelling of 2126509656 in words is "two billion, one hundred twenty-six million, five hundred nine thousand, six hundred fifty-six".