15690396748549 has 2 divisors, whose sum is σ = 15690396748550. Its totient is φ = 15690396748548.

The previous prime is 15690396748531. The next prime is 15690396748627. The reversal of 15690396748549 is 94584769309651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15205959868324 + 484436880225 = 3899482^2 + 696015^2 .

It is a cyclic number.

It is not a de Polignac number, because 15690396748549 - 2¹⁷ = 15690396617477 is a prime.

It is a super-2 number, since 2×15690396748549² (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 (15690396748529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7845198374274 + 7845198374275.

It is an arithmetic number, because the mean of its divisors is an integer number (7845198374275).

Almost surely, 2^{15690396748549} is an apocalyptic number.

It is an amenable number.

15690396748549 is a deficient number, since it is larger than the sum of its proper divisors (1).

15690396748549 is an equidigital number, since it uses as much as digits as its factorization.

15690396748549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1763596800, while the sum is 76.

The spelling of 15690396748549 in words is "fifteen trillion, six hundred ninety billion, three hundred ninety-six million, seven hundred forty-eight thousand, five hundred forty-nine".