366990661 has 2 divisors, whose sum is σ = 366990662. Its totient is φ = 366990660.

The previous prime is 366990619. The next prime is 366990667. The reversal of 366990661 is 166099663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265364100 + 101626561 = 16290^2 + 10081^2 .

It is an emirp because it is prime and its reverse (166099663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 366990661 - 2¹⁷ = 366859589 is a prime.

It is a super-2 number, since 2×366990661² = 269364290522433842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (366990667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 183495330 + 183495331.

It is an arithmetic number, because the mean of its divisors is an integer number (183495331).

Almost surely, 2^366990661 is an apocalyptic number.

It is an amenable number.

366990661 is a deficient number, since it is larger than the sum of its proper divisors (1).

366990661 is an equidigital number, since it uses as much as digits as its factorization.

366990661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 366990661 is about 19157.0003132014. Note that the first 3 decimals coincide. The cubic root of 366990661 is about 715.9538094533.

The spelling of 366990661 in words is "three hundred sixty-six million, nine hundred ninety thousand, six hundred sixty-one".