66276631 has 4 divisors (see below), whose sum is σ = 67817992. Its totient is φ = 64735272.

The previous prime is 66276599. The next prime is 66276649. The reversal of 66276631 is 13667266.

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

It is a cyclic number.

It is not a de Polignac number, because 66276631 - 2⁵ = 66276599 is a prime.

It is a super-2 number, since 2×66276631² = 8785183633420322, 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 (66276671) 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, 770616 + ... + 770701.

It is an arithmetic number, because the mean of its divisors is an integer number (16954498).

Almost surely, 2^66276631 is an apocalyptic number.

66276631 is a deficient number, since it is larger than the sum of its proper divisors (1541361).

66276631 is a wasteful number, since it uses less digits than its factorization.

66276631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541360.

The product of its digits is 54432, while the sum is 37.

The square root of 66276631 is about 8141.0460630069. The cubic root of 66276631 is about 404.6878273160.

The spelling of 66276631 in words is "sixty-six million, two hundred seventy-six thousand, six hundred thirty-one".