15534555040 has 96 divisors (see below), whose sum is σ = 38666315520. Its totient is φ = 5881549824.

The previous prime is 15534555017. The next prime is 15534555061. The reversal of 15534555040 is 4055543551.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6270282 + ... + 6272758.

It is an arithmetic number, because the mean of its divisors is an integer number (402774120).

Almost surely, 2^15534555040 is an apocalyptic number.

15534555040 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 15534555040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19333157760).

15534555040 is an abundant number, since it is smaller than the sum of its proper divisors (23131760480).

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

15534555040 is a wasteful number, since it uses less digits than its factorization.

15534555040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4574 (or 4566 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 37.

It can be divided in two parts, 1553455 and 5040, that added together give a triangular number (1558495 = T₁₇₆₅).

The spelling of 15534555040 in words is "fifteen billion, five hundred thirty-four million, five hundred fifty-five thousand, forty".