15495499459421 has 2 divisors, whose sum is σ = 15495499459422. Its totient is φ = 15495499459420.

The previous prime is 15495499459351. The next prime is 15495499459511. The reversal of 15495499459421 is 12495499459451.

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., 12330533928196 + 3164965531225 = 3511486^2 + 1779035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15495499459421 is a prime.

It is a super-2 number, since 2×15495499459421² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15495499456421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7747749729710 + 7747749729711.

It is an arithmetic number, because the mean of its divisors is an integer number (7747749729711).

Almost surely, 2^{15495499459421} is an apocalyptic number.

It is an amenable number.

15495499459421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15495499459421 is an equidigital number, since it uses as much as digits as its factorization.

15495499459421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904000, while the sum is 71.

The spelling of 15495499459421 in words is "fifteen trillion, four hundred ninety-five billion, four hundred ninety-nine million, four hundred fifty-nine thousand, four hundred twenty-one".