2156225756 has 12 divisors (see below), whose sum is σ = 3774240960. Its totient is φ = 1077871200.

The previous prime is 2156225749. The next prime is 2156225759. The reversal of 2156225756 is 6575226512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156225759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39545 + ... + 76656.

It is an arithmetic number, because the mean of its divisors is an integer number (314520080).

Almost surely, 2^2156225756 is an apocalyptic number.

It is an amenable number.

2156225756 is a deficient number, since it is larger than the sum of its proper divisors (1618015204).

2156225756 is a wasteful number, since it uses less digits than its factorization.

2156225756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120844 (or 120842 counting only the distinct ones).

The product of its digits is 252000, while the sum is 41.

The square root of 2156225756 is about 46435.1780011663. The cubic root of 2156225756 is about 1291.9074711602.

The spelling of 2156225756 in words is "two billion, one hundred fifty-six million, two hundred twenty-five thousand, seven hundred fifty-six".