66411831 has 4 divisors (see below), whose sum is σ = 88549112. Its totient is φ = 44274552.

The previous prime is 66411803. The next prime is 66411871. The reversal of 66411831 is 13811466.

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

It is not a de Polignac number, because 66411831 - 2¹³ = 66403639 is a prime.

It is a super-2 number, since 2×66411831² = 8821062593545122, 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 (66411871) 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, 11068636 + ... + 11068641.

It is an arithmetic number, because the mean of its divisors is an integer number (22137278).

Almost surely, 2^66411831 is an apocalyptic number.

66411831 is a deficient number, since it is larger than the sum of its proper divisors (22137281).

66411831 is a wasteful number, since it uses less digits than its factorization.

66411831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22137280.

The product of its digits is 3456, while the sum is 30.

The square root of 66411831 is about 8149.3454338370. The cubic root of 66411831 is about 404.9628193272.

The spelling of 66411831 in words is "sixty-six million, four hundred eleven thousand, eight hundred thirty-one".