868220661 has 24 divisors (see below), whose sum is σ = 1469051424. Its totient is φ = 451022880.

The previous prime is 868220659. The next prime is 868220663. The reversal of 868220661 is 166022868.

It is an interprime number because it is at equal distance from previous prime (868220659) and next prime (868220663).

It is not a de Polignac number, because 868220661 - 2¹ = 868220659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868220663) 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, 266850 + ... + 270083.

It is an arithmetic number, because the mean of its divisors is an integer number (61210476).

Almost surely, 2^868220661 is an apocalyptic number.

It is an amenable number.

868220661 is a deficient number, since it is larger than the sum of its proper divisors (600830763).

868220661 is a wasteful number, since it uses less digits than its factorization.

868220661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536961 (or 536954 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 868220661 is about 29465.5843485243. The cubic root of 868220661 is about 953.9890111643.

The spelling of 868220661 in words is "eight hundred sixty-eight million, two hundred twenty thousand, six hundred sixty-one".