66274621 has 8 divisors (see below), whose sum is σ = 78185984. Its totient is φ = 54974160.

The previous prime is 66274589. The next prime is 66274627. The reversal of 66274621 is 12647266.

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

It is not a de Polignac number, because 66274621 - 2⁵ = 66274589 is a prime.

It is a super-3 number, since 3×66274621³ (a number of 24 digits) contains 333 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 (66274627) 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, 152490 + ... + 152923.

It is an arithmetic number, because the mean of its divisors is an integer number (9773248).

Almost surely, 2^66274621 is an apocalyptic number.

It is an amenable number.

66274621 is a deficient number, since it is larger than the sum of its proper divisors (11911363).

66274621 is a wasteful number, since it uses less digits than its factorization.

66274621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305451.

The product of its digits is 24192, while the sum is 34.

The square root of 66274621 is about 8140.9226135617. The cubic root of 66274621 is about 404.6837362271.

The spelling of 66274621 in words is "sixty-six million, two hundred seventy-four thousand, six hundred twenty-one".