15551420304220 has 48 divisors (see below), whose sum is σ = 34579617599520. Its totient is φ = 5854554630144.

The previous prime is 15551420304137. The next prime is 15551420304281. The reversal of 15551420304220 is 2240302415551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21934312 + ... + 22632208.

It is an arithmetic number, because the mean of its divisors is an integer number (720408699990).

Almost surely, 2^{15551420304220} is an apocalyptic number.

15551420304220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15551420304220 is an abundant number, since it is smaller than the sum of its proper divisors (19028197295300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15551420304220 is a wasteful number, since it uses less digits than its factorization.

15551420304220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763462 (or 763460 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 15551420304220 its reverse (2240302415551), we get a palindrome (17791722719771).

The spelling of 15551420304220 in words is "fifteen trillion, five hundred fifty-one billion, four hundred twenty million, three hundred four thousand, two hundred twenty".