66315461 has 4 divisors (see below), whose sum is σ = 67305312. Its totient is φ = 65325612.

The previous prime is 66315443. The next prime is 66315481. The reversal of 66315461 is 16451366.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66315461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66315481) 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, 494825 + ... + 494958.

It is an arithmetic number, because the mean of its divisors is an integer number (16826328).

Almost surely, 2^66315461 is an apocalyptic number.

It is an amenable number.

66315461 is a deficient number, since it is larger than the sum of its proper divisors (989851).

66315461 is an equidigital number, since it uses as much as digits as its factorization.

66315461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989850.

The product of its digits is 12960, while the sum is 32.

The square root of 66315461 is about 8143.4305424680. The cubic root of 66315461 is about 404.7668444107.

The spelling of 66315461 in words is "sixty-six million, three hundred fifteen thousand, four hundred sixty-one".