15661650139 has 2 divisors, whose sum is σ = 15661650140. Its totient is φ = 15661650138.

The previous prime is 15661650127. The next prime is 15661650227. The reversal of 15661650139 is 93105616651.

15661650139 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 is a cyclic number.

It is not a de Polignac number, because 15661650139 - 2¹⁵ = 15661617371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15661650095 and 15661650104.

It is not a weakly prime, because it can be changed into another prime (15661650119) 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, 7830825069 + 7830825070.

It is an arithmetic number, because the mean of its divisors is an integer number (7830825070).

Almost surely, 2^15661650139 is an apocalyptic number.

15661650139 is a deficient number, since it is larger than the sum of its proper divisors (1).

15661650139 is an equidigital number, since it uses as much as digits as its factorization.

15661650139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145800, while the sum is 43.

The spelling of 15661650139 in words is "fifteen billion, six hundred sixty-one million, six hundred fifty thousand, one hundred thirty-nine".