15545357640 has 192 divisors, whose sum is σ = 51161338800. Its totient is φ = 4093286400.

The previous prime is 15545357627. The next prime is 15545357671. The reversal of 15545357640 is 4675354551.

15545357640 is a `hidden beast` number, since 1 + 5 + 5 + 4 + 535 + 76 + 40 = 666.

15545357640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 3812568516 + 11732789124 = 61746^2 + 108318^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16519570 + ... + 16520510.

Almost surely, 2^15545357640 is an apocalyptic number.

15545357640 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 15545357640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25580669400).

15545357640 is an abundant number, since it is smaller than the sum of its proper divisors (35615981160).

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

15545357640 is a wasteful number, since it uses less digits than its factorization.

15545357640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488 (or 1481 counting only the distinct ones).

The product of its (nonzero) digits is 1260000, while the sum is 45.

The spelling of 15545357640 in words is "fifteen billion, five hundred forty-five million, three hundred fifty-seven thousand, six hundred forty".