15820427750399 has 16 divisors (see below), whose sum is σ = 16057629937440. Its totient is φ = 15584892324480.

The previous prime is 15820427750363. The next prime is 15820427750429. The reversal of 15820427750399 is 99305772402851.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15820427750399 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 (15820427750329) 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, 525004937 + ... + 525035069.

It is an arithmetic number, because the mean of its divisors is an integer number (1003601871090).

Almost surely, 2^{15820427750399} is an apocalyptic number.

15820427750399 is a deficient number, since it is larger than the sum of its proper divisors (237202187041).

15820427750399 is a wasteful number, since it uses less digits than its factorization.

15820427750399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57530.

The product of its (nonzero) digits is 38102400, while the sum is 62.

The spelling of 15820427750399 in words is "fifteen trillion, eight hundred twenty billion, four hundred twenty-seven million, seven hundred fifty thousand, three hundred ninety-nine".