66746857 has 4 divisors (see below), whose sum is σ = 67551120. Its totient is φ = 65942596.

The previous prime is 66746839. The next prime is 66746881. The reversal of 66746857 is 75864766.

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-66746857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66746857.

It is not an unprimeable number, because it can be changed into a prime (66744857) 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, 402007 + ... + 402172.

It is an arithmetic number, because the mean of its divisors is an integer number (16887780).

Almost surely, 2^66746857 is an apocalyptic number.

It is an amenable number.

66746857 is a deficient number, since it is larger than the sum of its proper divisors (804263).

66746857 is an equidigital number, since it uses as much as digits as its factorization.

66746857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804262.

The product of its digits is 1693440, while the sum is 49.

The square root of 66746857 is about 8169.8749684435. The cubic root of 66746857 is about 405.6426458310.

It can be divided in two parts, 6674 and 6857, that added together give a palindrome (13531).

The spelling of 66746857 in words is "sixty-six million, seven hundred forty-six thousand, eight hundred fifty-seven".