366689561 has 4 divisors (see below), whose sum is σ = 419073792. Its totient is φ = 314305332.

The previous prime is 366689537. The next prime is 366689581. The reversal of 366689561 is 165986663.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-366689561 is a prime.

It is a super-2 number, since 2×366689561² = 268922468292745442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (366689501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26192105 + ... + 26192118.

It is an arithmetic number, because the mean of its divisors is an integer number (104768448).

Almost surely, 2^366689561 is an apocalyptic number.

It is an amenable number.

366689561 is a deficient number, since it is larger than the sum of its proper divisors (52384231).

366689561 is an equidigital number, since it uses as much as digits as its factorization.

366689561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52384230.

The product of its digits is 1399680, while the sum is 50.

The square root of 366689561 is about 19149.1399545776. The cubic root of 366689561 is about 715.7579528115.

The spelling of 366689561 in words is "three hundred sixty-six million, six hundred eighty-nine thousand, five hundred sixty-one".