15949574348621 has 16 divisors (see below), whose sum is σ = 15983218268160. Its totient is φ = 15915982118400.

The previous prime is 15949574348611. The next prime is 15949574348641. The reversal of 15949574348621 is 12684347594951.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15949574348621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15949574348611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4519571585 + ... + 4519575113.

It is an arithmetic number, because the mean of its divisors is an integer number (998951141760).

Almost surely, 2^{15949574348621} is an apocalyptic number.

It is an amenable number.

15949574348621 is a deficient number, since it is larger than the sum of its proper divisors (33643919539).

15949574348621 is a wasteful number, since it uses less digits than its factorization.

15949574348621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8516.

The product of its digits is 261273600, while the sum is 68.

The spelling of 15949574348621 in words is "fifteen trillion, nine hundred forty-nine billion, five hundred seventy-four million, three hundred forty-eight thousand, six hundred twenty-one".