15551144399 has 8 divisors (see below), whose sum is σ = 18545464320. Its totient is φ = 12750006456.

The previous prime is 15551144381. The next prime is 15551144419. The reversal of 15551144399 is 99344115551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15551144399 - 2²⁴ = 15534367183 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 (15551144359) 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, 48295319 + ... + 48295640.

It is an arithmetic number, because the mean of its divisors is an integer number (2318183040).

Almost surely, 2^15551144399 is an apocalyptic number.

15551144399 is a deficient number, since it is larger than the sum of its proper divisors (2994319921).

15551144399 is an equidigital number, since it uses as much as digits as its factorization.

15551144399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96590989.

The product of its digits is 486000, while the sum is 47.

The spelling of 15551144399 in words is "fifteen billion, five hundred fifty-one million, one hundred forty-four thousand, three hundred ninety-nine".