83566791 has 24 divisors (see below), whose sum is σ = 150493824. Its totient is φ = 43410960.

The previous prime is 83566789. The next prime is 83566801. The reversal of 83566791 is 19766538.

It is a happy number.

83566791 is a `hidden beast` number, since 83 + 566 + 7 + 9 + 1 = 666.

It is not a de Polignac number, because 83566791 - 2¹ = 83566789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83566741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59601 + ... + 60986.

It is an arithmetic number, because the mean of its divisors is an integer number (6270576).

Almost surely, 2^83566791 is an apocalyptic number.

83566791 is a deficient number, since it is larger than the sum of its proper divisors (66927033).

83566791 is a wasteful number, since it uses less digits than its factorization.

83566791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120611 (or 120608 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 83566791 is about 9141.4873516294. The cubic root of 83566791 is about 437.1977401753.

The spelling of 83566791 in words is "eighty-three million, five hundred sixty-six thousand, seven hundred ninety-one".