2151663591025 has 27 divisors (see below), whose sum is σ = 2889213839361. Its totient is φ = 1588850396640.

The previous prime is 2151663590987. The next prime is 2151663591041. The reversal of 2151663591025 is 5201953661512.

The square root of 2151663591025 is 1466855.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 554594473521 + 1597069117504 = 744711^2 + 1263752^2 .

It is not a de Polignac number, because 2151663591025 - 2⁷ = 2151663590897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 95334292 + ... + 95356858.

Almost surely, 2^{2151663591025} is an apocalyptic number.

2151663591025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2151663591025 is the 1466855-th square number.

2151663591025 is the 733428-th centered octagonal number.

It is an amenable number.

2151663591025 is a deficient number, since it is larger than the sum of its proper divisors (737550248336).

2151663591025 is an frugal number, since it uses more digits than its factorization.

2151663591025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45170 (or 22585 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 46.

The spelling of 2151663591025 in words is "two trillion, one hundred fifty-one billion, six hundred sixty-three million, five hundred ninety-one thousand, twenty-five".