66377261 has 4 divisors (see below), whose sum is σ = 67312224. Its totient is φ = 65442300.

The previous prime is 66377257. The next prime is 66377291. The reversal of 66377261 is 16277366.

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 not a de Polignac number, because 66377261 - 2² = 66377257 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 (66377291) 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, 467375 + ... + 467516.

It is an arithmetic number, because the mean of its divisors is an integer number (16828056).

Almost surely, 2^66377261 is an apocalyptic number.

It is an amenable number.

66377261 is a deficient number, since it is larger than the sum of its proper divisors (934963).

66377261 is an equidigital number, since it uses as much as digits as its factorization.

66377261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934962.

The product of its digits is 63504, while the sum is 38.

The square root of 66377261 is about 8147.2241284992. The cubic root of 66377261 is about 404.8925407124.

The spelling of 66377261 in words is "sixty-six million, three hundred seventy-seven thousand, two hundred sixty-one".