2156955818 has 8 divisors (see below), whose sum is σ = 3425753412. Its totient is φ = 1015038016.

The previous prime is 2156955803. The next prime is 2156955833. The reversal of 2156955818 is 8185596512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2156955803) and next prime (2156955833).

It can be written as a sum of positive squares in 2 ways, for example, as 1777212649 + 379743169 = 42157^2 + 19487^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31719905 + ... + 31719972.

Almost surely, 2^2156955818 is an apocalyptic number.

2156955818 is a deficient number, since it is larger than the sum of its proper divisors (1268797594).

2156955818 is a wasteful number, since it uses less digits than its factorization.

2156955818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63439896.

The product of its digits is 864000, while the sum is 50.

The square root of 2156955818 is about 46443.0384234279. The cubic root of 2156955818 is about 1292.0532607993.

The spelling of 2156955818 in words is "two billion, one hundred fifty-six million, nine hundred fifty-five thousand, eight hundred eighteen".