64505537 has 4 divisors (see below), whose sum is σ = 64522176. Its totient is φ = 64488900.

The previous prime is 64505521. The next prime is 64505561. The reversal of 64505537 is 73550546.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73550546 = 2 ⋅36775273.

It is a cyclic number.

It is not a de Polignac number, because 64505537 - 2⁴ = 64505521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64505497 and 64505506.

It is not an unprimeable number, because it can be changed into a prime (64505137) 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, 908 + ... + 11394.

It is an arithmetic number, because the mean of its divisors is an integer number (16130544).

Almost surely, 2^64505537 is an apocalyptic number.

It is an amenable number.

64505537 is a deficient number, since it is larger than the sum of its proper divisors (16639).

64505537 is a wasteful number, since it uses less digits than its factorization.

64505537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16638.

The product of its (nonzero) digits is 63000, while the sum is 35.

The square root of 64505537 is about 8031.5339132696. The cubic root of 64505537 is about 401.0504411023.

The spelling of 64505537 in words is "sixty-four million, five hundred five thousand, five hundred thirty-seven".