15520204222001 has 16 divisors (see below), whose sum is σ = 16315415793600. Its totient is φ = 14744986538688.

The previous prime is 15520204221997. The next prime is 15520204222013. The reversal of 15520204222001 is 10022240202551.

It is a cyclic number.

It is not a de Polignac number, because 15520204222001 - 2² = 15520204221997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15520204222021) 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, 3626810 + ... + 6647868.

It is an arithmetic number, because the mean of its divisors is an integer number (1019713487100).

Almost surely, 2^{15520204222001} is an apocalyptic number.

It is an amenable number.

15520204222001 is a deficient number, since it is larger than the sum of its proper divisors (795211571599).

15520204222001 is a wasteful number, since it uses less digits than its factorization.

15520204222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3024368.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 15520204222001 its reverse (10022240202551), we get a palindrome (25542444424552).

The spelling of 15520204222001 in words is "fifteen trillion, five hundred twenty billion, two hundred four million, two hundred twenty-two thousand, one".