15663366620 has 192 divisors, whose sum is σ = 38616044544. Its totient is φ = 5279662080.

The previous prime is 15663366617. The next prime is 15663366629. The reversal of 15663366620 is 2666336651.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15663366629) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41992754 + ... + 41993126.

It is an arithmetic number, because the mean of its divisors is an integer number (201125232).

Almost surely, 2^15663366620 is an apocalyptic number.

15663366620 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 15663366620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19308022272).

15663366620 is an abundant number, since it is smaller than the sum of its proper divisors (22952677924).

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

15663366620 is a wasteful number, since it uses less digits than its factorization.

15663366620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 44.

It can be divided in two parts, 15663 and 366620, that added together give a palindrome (382283).

The spelling of 15663366620 in words is "fifteen billion, six hundred sixty-three million, three hundred sixty-six thousand, six hundred twenty".