15161621663 has 4 divisors (see below), whose sum is σ = 15246323640. Its totient is φ = 15076919688.

The previous prime is 15161621647. The next prime is 15161621681. The reversal of 15161621663 is 36612616151.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15161621663 - 2⁴ = 15161621647 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 (15161621603) 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 3 ways as a sum of consecutive naturals, for example, 42350720 + ... + 42351077.

It is an arithmetic number, because the mean of its divisors is an integer number (3811580910).

Almost surely, 2^15161621663 is an apocalyptic number.

15161621663 is a deficient number, since it is larger than the sum of its proper divisors (84701977).

15161621663 is an equidigital number, since it uses as much as digits as its factorization.

15161621663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84701976.

The product of its digits is 38880, while the sum is 38.

The spelling of 15161621663 in words is "fifteen billion, one hundred sixty-one million, six hundred twenty-one thousand, six hundred sixty-three".