15500830993 has 2 divisors, whose sum is σ = 15500830994. Its totient is φ = 15500830992.

The previous prime is 15500830951. The next prime is 15500830997. The reversal of 15500830993 is 39903800551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9016072209 + 6484758784 = 94953^2 + 80528^2 .

It is a cyclic number.

It is not a de Polignac number, because 15500830993 - 2⁹ = 15500830481 is a prime.

It is a super-2 number, since 2×15500830993² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15500830997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7750415496 + 7750415497.

It is an arithmetic number, because the mean of its divisors is an integer number (7750415497).

Almost surely, 2^15500830993 is an apocalyptic number.

It is an amenable number.

15500830993 is a deficient number, since it is larger than the sum of its proper divisors (1).

15500830993 is an equidigital number, since it uses as much as digits as its factorization.

15500830993 is an evil number, because the sum of its binary digits is even.

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

The spelling of 15500830993 in words is "fifteen billion, five hundred million, eight hundred thirty thousand, nine hundred ninety-three".