2155177672 has 8 divisors (see below), whose sum is σ = 4040958150. Its totient is φ = 1077588832.

The previous prime is 2155177649. The next prime is 2155177699. The reversal of 2155177672 is 2767715512.

It can be written as a sum of positive squares in only one way, i.e., 2030944356 + 124233316 = 45066^2 + 11146^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 134698597 + ... + 134698612.

Almost surely, 2^2155177672 is an apocalyptic number.

It is an amenable number.

2155177672 is a deficient number, since it is larger than the sum of its proper divisors (1885780478).

2155177672 is a wasteful number, since it uses less digits than its factorization.

2155177672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269397215 (or 269397211 counting only the distinct ones).

The product of its digits is 205800, while the sum is 43.

The square root of 2155177672 is about 46423.8911768499. The cubic root of 2155177672 is about 1291.6981166138.

The spelling of 2155177672 in words is "two billion, one hundred fifty-five million, one hundred seventy-seven thousand, six hundred seventy-two".