15921745546 has 16 divisors (see below), whose sum is σ = 27757039680. Its totient is φ = 6707950560.

The previous prime is 15921745523. The next prime is 15921745547. The reversal of 15921745546 is 64554712951.

It is a self number, because there is not a number n which added to its sum of digits gives 15921745546.

It is not an unprimeable number, because it can be changed into a prime (15921745547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9637035 + ... + 9638686.

It is an arithmetic number, because the mean of its divisors is an integer number (1734814980).

Almost surely, 2^15921745546 is an apocalyptic number.

15921745546 is a deficient number, since it is larger than the sum of its proper divisors (11835294134).

15921745546 is a wasteful number, since it uses less digits than its factorization.

15921745546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19275789.

The product of its digits is 1512000, while the sum is 49.

The spelling of 15921745546 in words is "fifteen billion, nine hundred twenty-one million, seven hundred forty-five thousand, five hundred forty-six".