15551144401 has 8 divisors (see below), whose sum is σ = 16765084224. Its totient is φ = 14339732880.

The previous prime is 15551144381. The next prime is 15551144419. The reversal of 15551144401 is 10444115551.

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 15551144401 - 2²⁷ = 15416926673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15551144461) 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, 619285 + ... + 643906.

It is an arithmetic number, because the mean of its divisors is an integer number (2095635528).

Almost surely, 2^15551144401 is an apocalyptic number.

It is an amenable number.

15551144401 is a deficient number, since it is larger than the sum of its proper divisors (1213939823).

15551144401 is a wasteful number, since it uses less digits than its factorization.

15551144401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264151.

The product of its (nonzero) digits is 8000, while the sum is 31.

Adding to 15551144401 its reverse (10444115551), we get a palindrome (25995259952).

The spelling of 15551144401 in words is "fifteen billion, five hundred fifty-one million, one hundred forty-four thousand, four hundred one".