2155945970 has 32 divisors (see below), whose sum is σ = 3995088048. Its totient is φ = 837070848.

The previous prime is 2155945969. The next prime is 2155945973. The reversal of 2155945970 is 795495512.

It can be written as a sum of positive squares in 8 ways, for example, as 1719512089 + 436433881 = 41467^2 + 20891^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2155945973) 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 15 ways as a sum of consecutive naturals, for example, 153482 + ... + 166938.

Almost surely, 2^2155945970 is an apocalyptic number.

2155945970 is a deficient number, since it is larger than the sum of its proper divisors (1839142078).

2155945970 is a wasteful number, since it uses less digits than its factorization.

2155945970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13934.

The product of its (nonzero) digits is 567000, while the sum is 47.

The square root of 2155945970 is about 46432.1652521181. The cubic root of 2155945970 is about 1291.8515906078.

The spelling of 2155945970 in words is "two billion, one hundred fifty-five million, nine hundred forty-five thousand, nine hundred seventy".