65747521 has 4 divisors (see below), whose sum is σ = 75140032. Its totient is φ = 56355012.

The previous prime is 65747509. The next prime is 65747527. The reversal of 65747521 is 12574756.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65747521 - 2⁵ = 65747489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65747527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4696245 + ... + 4696258.

It is an arithmetic number, because the mean of its divisors is an integer number (18785008).

Almost surely, 2^65747521 is an apocalyptic number.

It is an amenable number.

65747521 is a deficient number, since it is larger than the sum of its proper divisors (9392511).

65747521 is an equidigital number, since it uses as much as digits as its factorization.

65747521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9392510.

The product of its digits is 58800, while the sum is 37.

The square root of 65747521 is about 8108.4845069840. The cubic root of 65747521 is about 403.6080262646.

The spelling of 65747521 in words is "sixty-five million, seven hundred forty-seven thousand, five hundred twenty-one".