2155252520 has 32 divisors (see below), whose sum is σ = 5134573800. Its totient is φ = 811388928.

The previous prime is 2155252487. The next prime is 2155252573. The reversal of 2155252520 is 252525512.

It can be written as a sum of positive squares in 4 ways, for example, as 2147951716 + 7300804 = 46346^2 + 2702^2 .

It is a super-2 number, since 2×2155252520² = 9290226849932700800, which contains 22 as substring.

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, 1584065 + ... + 1585424.

Almost surely, 2^2155252520 is an apocalyptic number.

2155252520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155252520 is an abundant number, since it is smaller than the sum of its proper divisors (2979321280).

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

2155252520 is a wasteful number, since it uses less digits than its factorization.

2155252520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3169517 (or 3169513 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 2155252520 is about 46424.6973064984. The cubic root of 2155252520 is about 1291.7130697354.

The spelling of 2155252520 in words is "two billion, one hundred fifty-five million, two hundred fifty-two thousand, five hundred twenty".