15723445478399 has 16 divisors (see below), whose sum is σ = 16784488800000. Its totient is φ = 14685761039040.

The previous prime is 15723445478369. The next prime is 15723445478459. The reversal of 15723445478399 is 99387454432751.

It is a Cunningham number, because it is equal to 3965280²-1.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15723445478399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (71).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15723445478339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75235952 + ... + 75444650.

It is an arithmetic number, because the mean of its divisors is an integer number (1049030550000).

Almost surely, 2^{15723445478399} is an apocalyptic number.

15723445478399 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

15723445478399 is a deficient number, since it is larger than the sum of its proper divisors (1061043321601).

15723445478399 is a wasteful number, since it uses less digits than its factorization.

15723445478399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264638.

The product of its digits is 914457600, while the sum is 71.

The spelling of 15723445478399 in words is "fifteen trillion, seven hundred twenty-three billion, four hundred forty-five million, four hundred seventy-eight thousand, three hundred ninety-nine".