15646613989 has 2 divisors, whose sum is σ = 15646613990. Its totient is φ = 15646613988.

The previous prime is 15646613987. The next prime is 15646614001. The reversal of 15646613989 is 98931664651.

It is a happy number.

15646613989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14128888225 + 1517725764 = 118865^2 + 38958^2 .

It is a cyclic number.

It is not a de Polignac number, because 15646613989 - 2¹ = 15646613987 is a prime.

Together with 15646613987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15646613987) 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 as a sum of consecutive naturals, namely, 7823306994 + 7823306995.

It is an arithmetic number, because the mean of its divisors is an integer number (7823306995).

Almost surely, 2^15646613989 is an apocalyptic number.

It is an amenable number.

15646613989 is a deficient number, since it is larger than the sum of its proper divisors (1).

15646613989 is an equidigital number, since it uses as much as digits as its factorization.

15646613989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8398080, while the sum is 58.

The spelling of 15646613989 in words is "fifteen billion, six hundred forty-six million, six hundred thirteen thousand, nine hundred eighty-nine".