663100261 has 8 divisors (see below), whose sum is σ = 685186304. Its totient is φ = 641057760.

The previous prime is 663100253. The next prime is 663100267. The reversal of 663100261 is 162001366.

663100261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 663100261 - 2³ = 663100253 is a prime.

It is a super-2 number, since 2×663100261² = 879403912276536242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663100267) 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, 21670 + ... + 42376.

It is an arithmetic number, because the mean of its divisors is an integer number (85648288).

Almost surely, 2^663100261 is an apocalyptic number.

It is an amenable number.

663100261 is a deficient number, since it is larger than the sum of its proper divisors (22086043).

663100261 is a wasteful number, since it uses less digits than its factorization.

663100261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21771.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 663100261 is about 25750.7332128621. The cubic root of 663100261 is about 872.0199074692.

The spelling of 663100261 in words is "six hundred sixty-three million, one hundred thousand, two hundred sixty-one".