65721465 has 24 divisors (see below), whose sum is σ = 118872000. Its totient is φ = 33526944.

The previous prime is 65721451. The next prime is 65721493. The reversal of 65721465 is 56412756.

It is a happy number.

It is not a de Polignac number, because 65721465 - 2⁹ = 65720953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30715 + ... + 32784.

It is an arithmetic number, because the mean of its divisors is an integer number (4953000).

Almost surely, 2^65721465 is an apocalyptic number.

It is an amenable number.

65721465 is a deficient number, since it is larger than the sum of its proper divisors (53150535).

65721465 is a wasteful number, since it uses less digits than its factorization.

65721465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63533 (or 63530 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 65721465 is about 8106.8776356869. The cubic root of 65721465 is about 403.5547020728.

It can be divided in two parts, 657 and 21465, that added together give a palindrome (22122).

The spelling of 65721465 in words is "sixty-five million, seven hundred twenty-one thousand, four hundred sixty-five".