6721125725 has 12 divisors (see below), whose sum is σ = 8511520704. Its totient is φ = 5262497520.

The previous prime is 6721125679. The next prime is 6721125751. The reversal of 6721125725 is 5275211276.

It is a de Polignac number, because none of the positive numbers 2^k-6721125725 is a prime.

It is a super-2 number, since 2×6721125725² = 90347062022513551250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2858879 + ... + 2861228.

It is an arithmetic number, because the mean of its divisors is an integer number (709293392).

Almost surely, 2^6721125725 is an apocalyptic number.

It is an amenable number.

6721125725 is a deficient number, since it is larger than the sum of its proper divisors (1790394979).

6721125725 is a wasteful number, since it uses less digits than its factorization.

6721125725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5720164 (or 5720159 counting only the distinct ones).

The product of its digits is 58800, while the sum is 38.

The square root of 6721125725 is about 81982.4720595811. The cubic root of 6721125725 is about 1887.1829597760.

The spelling of 6721125725 in words is "six billion, seven hundred twenty-one million, one hundred twenty-five thousand, seven hundred twenty-five".