83791666 has 36 divisors (see below), whose sum is σ = 149162958. Its totient is φ = 35197344.

The previous prime is 83791651. The next prime is 83791681. The reversal of 83791666 is 66619738.

It is an interprime number because it is at equal distance from previous prime (83791651) and next prime (83791681).

It can be written as a sum of positive squares in only one way, i.e., 68807025 + 14984641 = 8295^2 + 3871^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 611550 + ... + 611686.

Almost surely, 2^83791666 is an apocalyptic number.

83791666 is a deficient number, since it is larger than the sum of its proper divisors (65371292).

83791666 is a wasteful number, since it uses less digits than its factorization.

83791666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 225 counting only the distinct ones).

The product of its digits is 326592, while the sum is 46.

The square root of 83791666 is about 9153.7787825575. The cubic root of 83791666 is about 437.5895496693.

The spelling of 83791666 in words is "eighty-three million, seven hundred ninety-one thousand, six hundred sixty-six".