2168977835025 has 81 divisors (see below), whose sum is σ = 3971196991281. Its totient is φ = 1131633694080.

The previous prime is 2168977834993. The next prime is 2168977835081. The reversal of 2168977835025 is 5205387798612.

The square root of 2168977835025 is 1472745.

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 179287036929 + 1989690798096 = 423423^2 + 1410564^2 .

It is not a de Polignac number, because 2168977835025 - 2⁵ = 2168977834993 is a prime.

It is a super-2 number, since 2×2168977835025² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1038284181 + ... + 1038286269.

Almost surely, 2^{2168977835025} is an apocalyptic number.

2168977835025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2168977835025 is the 1472745-th square number.

2168977835025 is the 736373-rd centered octagonal number.

It is an amenable number.

2168977835025 is a deficient number, since it is larger than the sum of its proper divisors (1802219156256).

2168977835025 is an frugal number, since it uses more digits than its factorization.

2168977835025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288 (or 2144 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 2168977835025 in words is "two trillion, one hundred sixty-eight billion, nine hundred seventy-seven million, eight hundred thirty-five thousand, twenty-five".