65491329725 has 12 divisors (see below), whose sum is σ = 81238961460. Its totient is φ = 52373894400.

The previous prime is 65491329689. The next prime is 65491329791. The reversal of 65491329725 is 52792319456.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 6526377796 + 58964951929 = 80786^2 + 242827^2 .

It is not a de Polignac number, because 65491329725 - 2¹⁰ = 65491328701 is a prime.

It is a super-2 number, since 2×65491329725² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 409340 + ... + 546389.

It is an arithmetic number, because the mean of its divisors is an integer number (6769913455).

Almost surely, 2^65491329725 is an apocalyptic number.

It is an amenable number.

65491329725 is a deficient number, since it is larger than the sum of its proper divisors (15747631735).

65491329725 is a wasteful number, since it uses less digits than its factorization.

65491329725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958480 (or 958475 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 53.

The spelling of 65491329725 in words is "sixty-five billion, four hundred ninety-one million, three hundred twenty-nine thousand, seven hundred twenty-five".