999542257840 has 160 divisors (see below), whose sum is σ = 2756926402560. Its totient is φ = 329791564800.

The previous prime is 999542257811. The next prime is 999542257853. The reversal of 999542257840 is 48752245999.

It is a happy number.

999542257840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2946610 + ... + 3268270.

It is an arithmetic number, because the mean of its divisors is an integer number (17230790016).

Almost surely, 2^999542257840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999542257840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1378463201280).

999542257840 is an abundant number, since it is smaller than the sum of its proper divisors (1757384144720).

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

999542257840 is a wasteful number, since it uses less digits than its factorization.

999542257840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321891 (or 321885 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 64.

The spelling of 999542257840 in words is "nine hundred ninety-nine billion, five hundred forty-two million, two hundred fifty-seven thousand, eight hundred forty".