866461401 has 32 divisors (see below), whose sum is σ = 1384987520. Its totient is φ = 532204992.

The previous prime is 866461397. The next prime is 866461417. The reversal of 866461401 is 104164668.

866461401 is a `hidden beast` number, since 8 + 6 + 646 + 1 + 4 + 0 + 1 = 666.

It is not a de Polignac number, because 866461401 - 2² = 866461397 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866461901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 213150 + ... + 217176.

It is an arithmetic number, because the mean of its divisors is an integer number (43280860).

Almost surely, 2^866461401 is an apocalyptic number.

It is an amenable number.

866461401 is a deficient number, since it is larger than the sum of its proper divisors (518526119).

866461401 is a wasteful number, since it uses less digits than its factorization.

866461401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4662 (or 4656 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 866461401 is about 29435.7164173050. The cubic root of 866461401 is about 953.3442251705.

The spelling of 866461401 in words is "eight hundred sixty-six million, four hundred sixty-one thousand, four hundred one".