15510780497 has 2 divisors, whose sum is σ = 15510780498. Its totient is φ = 15510780496.

The previous prime is 15510780491. The next prime is 15510780517. The reversal of 15510780497 is 79408701551.

15510780497 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., 11774637121 + 3736143376 = 108511^2 + 61124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15510780497 is a prime.

It is a super-2 number, since 2×15510780497² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15510780491) 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, 7755390248 + 7755390249.

It is an arithmetic number, because the mean of its divisors is an integer number (7755390249).

Almost surely, 2^15510780497 is an apocalyptic number.

It is an amenable number.

15510780497 is a deficient number, since it is larger than the sum of its proper divisors (1).

15510780497 is an equidigital number, since it uses as much as digits as its factorization.

15510780497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 352800, while the sum is 47.

The spelling of 15510780497 in words is "fifteen billion, five hundred ten million, seven hundred eighty thousand, four hundred ninety-seven".