66274669 has 4 divisors (see below), whose sum is σ = 66300444. Its totient is φ = 66248896.

The previous prime is 66274667. The next prime is 66274673. The reversal of 66274669 is 96647266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33062500 + 33212169 = 5750^2 + 5763^2 .

It is a cyclic number.

It is not a de Polignac number, because 66274669 - 2¹ = 66274667 is a prime.

It is a super-2 number, since 2×66274669² = 8784663502119122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66274667) 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, 8542 + ... + 14335.

It is an arithmetic number, because the mean of its divisors is an integer number (16575111).

Almost surely, 2^66274669 is an apocalyptic number.

It is an amenable number.

66274669 is a deficient number, since it is larger than the sum of its proper divisors (25775).

66274669 is a wasteful number, since it uses less digits than its factorization.

66274669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25774.

The product of its digits is 653184, while the sum is 46.

The square root of 66274669 is about 8140.9255616300. The cubic root of 66274669 is about 404.6838339257.

The spelling of 66274669 in words is "sixty-six million, two hundred seventy-four thousand, six hundred sixty-nine".