15523452420 has 192 divisors, whose sum is σ = 52877131776. Its totient is φ = 3321722880.

The previous prime is 15523452397. The next prime is 15523452457. The reversal of 15523452420 is 2425432551.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1358049 + ... + 1369431.

It is an arithmetic number, because the mean of its divisors is an integer number (275401728).

Almost surely, 2^15523452420 is an apocalyptic number.

15523452420 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 15523452420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26438565888).

15523452420 is an abundant number, since it is smaller than the sum of its proper divisors (37353679356).

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

15523452420 is a wasteful number, since it uses less digits than its factorization.

15523452420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11610 (or 11608 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

Adding to 15523452420 its reverse (2425432551), we get a palindrome (17948884971).

The spelling of 15523452420 in words is "fifteen billion, five hundred twenty-three million, four hundred fifty-two thousand, four hundred twenty".