2261211656 has 16 divisors (see below), whose sum is σ = 4625205840. Its totient is φ = 1027823440.

The previous prime is 2261211653. The next prime is 2261211671. The reversal of 2261211656 is 6561121622.

It is a super-2 number, since 2×2261211656² = 10226156306460524672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2261211653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12847706 + ... + 12847881.

It is an arithmetic number, because the mean of its divisors is an integer number (289075365).

Almost surely, 2^2261211656 is an apocalyptic number.

It is an amenable number.

2261211656 is an abundant number, since it is smaller than the sum of its proper divisors (2363994184).

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

2261211656 is a wasteful number, since it uses less digits than its factorization.

2261211656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25695604 (or 25695600 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 2261211656 is about 47552.1992761639. The cubic root of 2261211656 is about 1312.5435994103.

The spelling of 2261211656 in words is "two billion, two hundred sixty-one million, two hundred eleven thousand, six hundred fifty-six".