6521370025 has 27 divisors (see below), whose sum is σ = 8371837029. Its totient is φ = 5039112000.

The previous prime is 6521369993. The next prime is 6521370029. The reversal of 6521370025 is 5200731256.

The square root of 6521370025 is 80755.

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 818703769 + 5702666256 = 28613^2 + 75516^2 .

It is not a de Polignac number, because 6521370025 - 2⁵ = 6521369993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (6521370029) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12516765 + ... + 12517285.

Almost surely, 2^6521370025 is an apocalyptic number.

6521370025 is the 80755-th square number.

6521370025 is the 40378-th centered octagonal number.

It is an amenable number.

6521370025 is a deficient number, since it is larger than the sum of its proper divisors (1850467004).

6521370025 is an frugal number, since it uses more digits than its factorization.

6521370025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The cubic root of 6521370025 is about 1868.2985682275.

The spelling of 6521370025 in words is "six billion, five hundred twenty-one million, three hundred seventy thousand, twenty-five".