65664534 has 32 divisors (see below), whose sum is σ = 144887904. Its totient is φ = 19710720.

The previous prime is 65664491. The next prime is 65664553. The reversal of 65664534 is 43546656.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 65664492 and 65664501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7069 + ... + 13464.

It is an arithmetic number, because the mean of its divisors is an integer number (4527747).

Almost surely, 2^65664534 is an apocalyptic number.

65664534 is an abundant number, since it is smaller than the sum of its proper divisors (79223370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65664534 is a wasteful number, since it uses less digits than its factorization.

65664534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20592.

The product of its digits is 259200, while the sum is 39.

The square root of 65664534 is about 8103.3655970837. The cubic root of 65664534 is about 403.4381424380.

The spelling of 65664534 in words is "sixty-five million, six hundred sixty-four thousand, five hundred thirty-four".