65375721 has 16 divisors (see below), whose sum is σ = 97036800. Its totient is φ = 43501104.

The previous prime is 65375701. The next prime is 65375743. The reversal of 65375721 is 12757356.

It is not a de Polignac number, because 65375721 - 2¹³ = 65367529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65375701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14395 + ... + 18383.

It is an arithmetic number, because the mean of its divisors is an integer number (6064800).

Almost surely, 2^65375721 is an apocalyptic number.

It is an amenable number.

65375721 is a deficient number, since it is larger than the sum of its proper divisors (31661079).

65375721 is a wasteful number, since it uses less digits than its factorization.

65375721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4605 (or 4599 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 65375721 is about 8085.5254003682. The cubic root of 65375721 is about 402.8457910854.

The spelling of 65375721 in words is "sixty-five million, three hundred seventy-five thousand, seven hundred twenty-one".