2155780137 has 24 divisors (see below), whose sum is σ = 3361208832. Its totient is φ = 1225408800.

The previous prime is 2155780129. The next prime is 2155780153. The reversal of 2155780137 is 7310875512.

It is not a de Polignac number, because 2155780137 - 2³ = 2155780129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2155780095 and 2155780104.

It is not an unprimeable number, because it can be changed into a prime (2155780937) 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 23 ways as a sum of consecutive naturals, for example, 10314 + ... + 66467.

It is an arithmetic number, because the mean of its divisors is an integer number (140050368).

Almost surely, 2^2155780137 is an apocalyptic number.

It is an amenable number.

2155780137 is a deficient number, since it is larger than the sum of its proper divisors (1205428695).

2155780137 is a wasteful number, since it uses less digits than its factorization.

2155780137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76989 (or 76982 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 39.

The square root of 2155780137 is about 46430.3794621582. The cubic root of 2155780137 is about 1291.8184671559.

The spelling of 2155780137 in words is "two billion, one hundred fifty-five million, seven hundred eighty thousand, one hundred thirty-seven".