15641563420 has 144 divisors (see below), whose sum is σ = 40412252160. Its totient is φ = 5056442496.

The previous prime is 15641563373. The next prime is 15641563423. The reversal of 15641563420 is 2436514651.

It is a self number, because there is not a number n which added to its sum of digits gives 15641563420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15641563423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4150377 + ... + 4154143.

It is an arithmetic number, because the mean of its divisors is an integer number (280640640).

Almost surely, 2^15641563420 is an apocalyptic number.

15641563420 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 15641563420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20206126080).

15641563420 is an abundant number, since it is smaller than the sum of its proper divisors (24770688740).

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

15641563420 is a wasteful number, since it uses less digits than its factorization.

15641563420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4032 (or 4023 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 15641563420 in words is "fifteen billion, six hundred forty-one million, five hundred sixty-three thousand, four hundred twenty".