2155658520 has 32 divisors (see below), whose sum is σ = 6466975920. Its totient is φ = 574842240.

The previous prime is 2155658473. The next prime is 2155658539. The reversal of 2155658520 is 258565512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8981791 + ... + 8982030.

Almost surely, 2^2155658520 is an apocalyptic number.

2155658520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155658520 is an abundant number, since it is smaller than the sum of its proper divisors (4311317400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2155658520 is a wasteful number, since it uses less digits than its factorization.

2155658520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17963835 (or 17963831 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 39.

The square root of 2155658520 is about 46429.0697731497. The cubic root of 2155658520 is about 1291.7941743197.

It can be divided in two parts, 2155 and 658520, that added together give a triangular number (660675 = T₁₁₄₉).

The spelling of 2155658520 in words is "two billion, one hundred fifty-five million, six hundred fifty-eight thousand, five hundred twenty".