15520402000 has 80 divisors (see below), whose sum is σ = 37563649344. Its totient is φ = 6202320000.

The previous prime is 15520401961. The next prime is 15520402003. The reversal of 15520402000 is 20402551.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15520402003) 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, 2578995 + ... + 2585005.

Almost surely, 2^15520402000 is an apocalyptic number.

15520402000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15520402000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18781824672).

15520402000 is an abundant number, since it is smaller than the sum of its proper divisors (22043247344).

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

15520402000 is a wasteful number, since it uses less digits than its factorization.

15520402000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7325 (or 7309 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

Adding to 15520402000 its reverse (20402551), we get a palindrome (15540804551).

The spelling of 15520402000 in words is "fifteen billion, five hundred twenty million, four hundred two thousand".