15550000040 has 64 divisors (see below), whose sum is σ = 35147250000. Its totient is φ = 6191677440.

The previous prime is 15550000009. The next prime is 15550000043. The reversal of 15550000040 is 4000005551.

It can be written as a sum of positive squares in 8 ways, for example, as 4186866436 + 11363133604 = 64706^2 + 106598^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 15549999967 and 15550000021.

It is not an unprimeable number, because it can be changed into a prime (15550000043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12449336 + ... + 12450584.

Almost surely, 2^15550000040 is an apocalyptic number.

15550000040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15550000040 is an abundant number, since it is smaller than the sum of its proper divisors (19597249960).

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

15550000040 is a wasteful number, since it uses less digits than its factorization.

15550000040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430 (or 2426 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

Adding to 15550000040 its reverse (4000005551), we get a palindrome (19550005591).

It can be divided in two parts, 15 and 550000040, that added together give a palindrome (550000055).

The spelling of 15550000040 in words is "fifteen billion, five hundred fifty million, forty", and thus it is an aban number.