15556123040 has 48 divisors (see below), whose sum is σ = 36835223040. Its totient is φ = 6208247040.

The previous prime is 15556123019. The next prime is 15556123043. The reversal of 15556123040 is 4032165551.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 15556122988 and 15556123006.

It is not an unprimeable number, because it can be changed into a prime (15556123043) 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 7 ways as a sum of consecutive naturals, for example, 40496 + ... + 180975.

It is an arithmetic number, because the mean of its divisors is an integer number (767400480).

Almost surely, 2^15556123040 is an apocalyptic number.

15556123040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15556123040 is an abundant number, since it is smaller than the sum of its proper divisors (21279100000).

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

15556123040 is a wasteful number, since it uses less digits than its factorization.

15556123040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221925 (or 221917 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 15556123040 its reverse (4032165551), we get a palindrome (19588288591).

The spelling of 15556123040 in words is "fifteen billion, five hundred fifty-six million, one hundred twenty-three thousand, forty".