15631400000 has 84 divisors (see below), whose sum is σ = 38771213796. Its totient is φ = 6252480000.

The previous prime is 15631399969. The next prime is 15631400009. The reversal of 15631400000 is 413651.

It can be written as a sum of positive squares in 6 ways, for example, as 15529147456 + 102252544 = 124616^2 + 10112^2 .

It is a sliding number, since 15631400000 = 6400000 + 15625000000 and 1/6400000 + 1/15625000000 = 0.00000015631400000.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (15631400009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160922 + ... + 239078.

It is an arithmetic number, because the mean of its divisors is an integer number (461562069).

Almost surely, 2^15631400000 is an apocalyptic number.

15631400000 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 15631400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19385606898).

15631400000 is an abundant number, since it is smaller than the sum of its proper divisors (23139813796).

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

15631400000 is an frugal number, since it uses more digits than its factorization.

15631400000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78194 (or 78164 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 15631400000 its reverse (413651), we get a palindrome (15631813651).

The spelling of 15631400000 in words is "fifteen billion, six hundred thirty-one million, four hundred thousand".