15220409993 has 2 divisors, whose sum is σ = 15220409994. Its totient is φ = 15220409992.

The previous prime is 15220409983. The next prime is 15220410031. The reversal of 15220409993 is 39990402251.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12176460409 + 3043949584 = 110347^2 + 55172^2 .

It is a cyclic number.

It is not a de Polignac number, because 15220409993 - 2⁶ = 15220409929 is a prime.

It is not a weakly prime, because it can be changed into another prime (15220409983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610204996 + 7610204997.

It is an arithmetic number, because the mean of its divisors is an integer number (7610204997).

Almost surely, 2^15220409993 is an apocalyptic number.

It is an amenable number.

15220409993 is a deficient number, since it is larger than the sum of its proper divisors (1).

15220409993 is an equidigital number, since it uses as much as digits as its factorization.

15220409993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 44.

The spelling of 15220409993 in words is "fifteen billion, two hundred twenty million, four hundred nine thousand, nine hundred ninety-three".