372405661 has 2 divisors, whose sum is σ = 372405662. Its totient is φ = 372405660.

The previous prime is 372405599. The next prime is 372405679. The reversal of 372405661 is 166504273.

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., 190964761 + 181440900 = 13819^2 + 13470^2 .

It is a cyclic number.

It is not a de Polignac number, because 372405661 - 2¹⁵ = 372372893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (372405161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 186202830 + 186202831.

It is an arithmetic number, because the mean of its divisors is an integer number (186202831).

Almost surely, 2^372405661 is an apocalyptic number.

It is an amenable number.

372405661 is a deficient number, since it is larger than the sum of its proper divisors (1).

372405661 is an equidigital number, since it uses as much as digits as its factorization.

372405661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 372405661 is about 19297.8149281207. The cubic root of 372405661 is about 719.4579646001.

The spelling of 372405661 in words is "three hundred seventy-two million, four hundred five thousand, six hundred sixty-one".