2156225545 has 16 divisors (see below), whose sum is σ = 2817576000. Its totient is φ = 1577838528.

The previous prime is 2156225527. The next prime is 2156225563. The reversal of 2156225545 is 5455226512.

It is an interprime number because it is at equal distance from previous prime (2156225527) and next prime (2156225563).

It is a cyclic number.

It is not a de Polignac number, because 2156225545 - 2⁷ = 2156225417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388575 + ... + 394084.

It is an arithmetic number, because the mean of its divisors is an integer number (176098500).

Almost surely, 2^2156225545 is an apocalyptic number.

It is an amenable number.

2156225545 is a deficient number, since it is larger than the sum of its proper divisors (661350455).

2156225545 is a wasteful number, since it uses less digits than its factorization.

2156225545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782712.

The product of its digits is 120000, while the sum is 37.

The square root of 2156225545 is about 46435.1757291819. The cubic root of 2156225545 is about 1291.9074290198.

The spelling of 2156225545 in words is "two billion, one hundred fifty-six million, two hundred twenty-five thousand, five hundred forty-five".