15546621479 has 2 divisors, whose sum is σ = 15546621480. Its totient is φ = 15546621478.

The previous prime is 15546621463. The next prime is 15546621521. The reversal of 15546621479 is 97412664551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15546621479 - 2⁴ = 15546621463 is a prime.

It is a super-2 number, since 2×15546621479² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15546624479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7773310739 + 7773310740.

It is an arithmetic number, because the mean of its divisors is an integer number (7773310740).

Almost surely, 2^15546621479 is an apocalyptic number.

15546621479 is a deficient number, since it is larger than the sum of its proper divisors (1).

15546621479 is an equidigital number, since it uses as much as digits as its factorization.

15546621479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 50.

The spelling of 15546621479 in words is "fifteen billion, five hundred forty-six million, six hundred twenty-one thousand, four hundred seventy-nine".