15618055581647 has 2 divisors, whose sum is σ = 15618055581648. Its totient is φ = 15618055581646.

The previous prime is 15618055581571. The next prime is 15618055581691. The reversal of 15618055581647 is 74618555081651.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15618055581647 is a prime.

It is a super-2 number, since 2×15618055581647² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15618055581647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15618055581697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7809027790823 + 7809027790824.

It is an arithmetic number, because the mean of its divisors is an integer number (7809027790824).

Almost surely, 2^{15618055581647} is an apocalyptic number.

15618055581647 is a deficient number, since it is larger than the sum of its proper divisors (1).

15618055581647 is an equidigital number, since it uses as much as digits as its factorization.

15618055581647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320000, while the sum is 62.

The spelling of 15618055581647 in words is "fifteen trillion, six hundred eighteen billion, fifty-five million, five hundred eighty-one thousand, six hundred forty-seven".