31820666823 has 48 divisors (see below), whose sum is σ = 50507698176. Its totient is φ = 19144984320.

The previous prime is 31820666791. The next prime is 31820666837. The reversal of 31820666823 is 32866602813.

It is a happy number.

It is not a de Polignac number, because 31820666823 - 2⁵ = 31820666791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31820666863) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8605311 + ... + 8609007.

It is an arithmetic number, because the mean of its divisors is an integer number (1052243712).

Almost surely, 2^31820666823 is an apocalyptic number.

31820666823 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31820666823 is a deficient number, since it is larger than the sum of its proper divisors (18687031353).

31820666823 is a wasteful number, since it uses less digits than its factorization.

31820666823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4324 (or 4321 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 31820666823 in words is "thirty-one billion, eight hundred twenty million, six hundred sixty-six thousand, eight hundred twenty-three".