866252491 has 8 divisors (see below), whose sum is σ = 944128080. Its totient is φ = 789982752.

The previous prime is 866252479. The next prime is 866252599. The reversal of 866252491 is 194252668.

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

It is not a de Polignac number, because 866252491 - 2⁷ = 866252363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866252411) 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, 400336 + ... + 402493.

It is an arithmetic number, because the mean of its divisors is an integer number (118016010).

Almost surely, 2^866252491 is an apocalyptic number.

866252491 is a deficient number, since it is larger than the sum of its proper divisors (77875589).

866252491 is a wasteful number, since it uses less digits than its factorization.

866252491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802925.

The product of its digits is 207360, while the sum is 43.

The square root of 866252491 is about 29432.1676231976. The cubic root of 866252491 is about 953.2675996564.

The spelling of 866252491 in words is "eight hundred sixty-six million, two hundred fifty-two thousand, four hundred ninety-one".