66013831 has 8 divisors (see below), whose sum is σ = 73543680. Its totient is φ = 58834272.

The previous prime is 66013819. The next prime is 66013837. The reversal of 66013831 is 13831066.

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

It is not a de Polignac number, because 66013831 - 2⁵ = 66013799 is a prime.

It is a super-2 number, since 2×66013831² = 8715651766593122, which contains 22 as substring.

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 66013831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66013837) 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, 87175 + ... + 87928.

It is an arithmetic number, because the mean of its divisors is an integer number (9192960).

Almost surely, 2^66013831 is an apocalyptic number.

66013831 is a deficient number, since it is larger than the sum of its proper divisors (7529849).

66013831 is a wasteful number, since it uses less digits than its factorization.

66013831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175145.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 66013831 is about 8124.8895992499. The cubic root of 66013831 is about 404.1522295808.

Adding to 66013831 its reverse (13831066), we get a palindrome (79844897).

The spelling of 66013831 in words is "sixty-six million, thirteen thousand, eight hundred thirty-one".