661582333 has 2 divisors, whose sum is σ = 661582334. Its totient is φ = 661582332.

The previous prime is 661582309. The next prime is 661582349. The reversal of 661582333 is 333285166.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 562021849 + 99560484 = 23707^2 + 9978^2 .

It is a cyclic number.

It is not a de Polignac number, because 661582333 - 2²⁵ = 628027901 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661582292 and 661582301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661582303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330791166 + 330791167.

It is an arithmetic number, because the mean of its divisors is an integer number (330791167).

Almost surely, 2^661582333 is an apocalyptic number.

It is an amenable number.

661582333 is a deficient number, since it is larger than the sum of its proper divisors (1).

661582333 is an equidigital number, since it uses as much as digits as its factorization.

661582333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 37.

The square root of 661582333 is about 25721.2428354463. The cubic root of 661582333 is about 871.3540077984.

The spelling of 661582333 in words is "six hundred sixty-one million, five hundred eighty-two thousand, three hundred thirty-three".