15607661 has 2 divisors, whose sum is σ = 15607662. Its totient is φ = 15607660.

The previous prime is 15607621. The next prime is 15607679. The reversal of 15607661 is 16670651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14212900 + 1394761 = 3770^2 + 1181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15607661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15607621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7803830 + 7803831.

It is an arithmetic number, because the mean of its divisors is an integer number (7803831).

Almost surely, 2^15607661 is an apocalyptic number.

It is an amenable number.

15607661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15607661 is an equidigital number, since it uses as much as digits as its factorization.

15607661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 15607661 is about 3950.6532371242. The cubic root of 15607661 is about 249.9074911060.

The spelling of 15607661 in words is "fifteen million, six hundred seven thousand, six hundred sixty-one".