65815651725 has 48 divisors (see below), whose sum is σ = 120225555072. Its totient is φ = 31600476160.

The previous prime is 65815651723. The next prime is 65815651747. The reversal of 65815651725 is 52715651856.

It is a happy number.

It is not a de Polignac number, because 65815651725 - 2¹ = 65815651723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65815651723) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1092852 + ... + 1151501.

It is an arithmetic number, because the mean of its divisors is an integer number (2504699064).

Almost surely, 2^65815651725 is an apocalyptic number.

It is an amenable number.

65815651725 is a deficient number, since it is larger than the sum of its proper divisors (54409903347).

65815651725 is a wasteful number, since it uses less digits than its factorization.

65815651725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244406 (or 2244401 counting only the distinct ones).

The product of its digits is 2520000, while the sum is 51.

The spelling of 65815651725 in words is "sixty-five billion, eight hundred fifteen million, six hundred fifty-one thousand, seven hundred twenty-five".