15436779306493 has 2 divisors, whose sum is σ = 15436779306494. Its totient is φ = 15436779306492.

The previous prime is 15436779306457. The next prime is 15436779306523. The reversal of 15436779306493 is 39460397763451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15110650366564 + 326128939929 = 3887242^2 + 571077^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15436779306493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15436779304493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7718389653246 + 7718389653247.

It is an arithmetic number, because the mean of its divisors is an integer number (7718389653247).

Almost surely, 2^{15436779306493} is an apocalyptic number.

It is an amenable number.

15436779306493 is a deficient number, since it is larger than the sum of its proper divisors (1).

15436779306493 is an equidigital number, since it uses as much as digits as its factorization.

15436779306493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 308629440, while the sum is 67.

The spelling of 15436779306493 in words is "fifteen trillion, four hundred thirty-six billion, seven hundred seventy-nine million, three hundred six thousand, four hundred ninety-three".