15864009540820 has 24 divisors (see below), whose sum is σ = 38073622898304. Its totient is φ = 5439088985376.

The previous prime is 15864009540809. The next prime is 15864009540853. The reversal of 15864009540820 is 2804590046851.

It is a super-3 number, since 3×15864009540820³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56657176792 + ... + 56657177071.

It is an arithmetic number, because the mean of its divisors is an integer number (1586400954096).

Almost surely, 2^{15864009540820} is an apocalyptic number.

15864009540820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15864009540820 is an abundant number, since it is smaller than the sum of its proper divisors (22209613357484).

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

15864009540820 is a wasteful number, since it uses less digits than its factorization.

15864009540820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113314353879 (or 113314353877 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 15864009540820 in words is "fifteen trillion, eight hundred sixty-four billion, nine million, five hundred forty thousand, eight hundred twenty".