66934561 has 8 divisors (see below), whose sum is σ = 67464704. Its totient is φ = 66407040.

The previous prime is 66934547. The next prime is 66934583. The reversal of 66934561 is 16543966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66934561 - 2²³ = 58545953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66934061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99121 + ... + 99793.

It is an arithmetic number, because the mean of its divisors is an integer number (8433088).

Almost surely, 2^66934561 is an apocalyptic number.

It is an amenable number.

66934561 is a deficient number, since it is larger than the sum of its proper divisors (530143).

66934561 is a wasteful number, since it uses less digits than its factorization.

66934561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311.

The product of its digits is 116640, while the sum is 40.

The square root of 66934561 is about 8181.3544722130. The cubic root of 66934561 is about 406.0225363015.

The spelling of 66934561 in words is "sixty-six million, nine hundred thirty-four thousand, five hundred sixty-one".