999978000522 has 64 divisors (see below), whose sum is σ = 2080726272000. Its totient is φ = 319997684160.

The previous prime is 999978000521. The next prime is 999978000529. The reversal of 999978000522 is 225000879999.

It is not an unprimeable number, because it can be changed into a prime (999978000521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55634997 + ... + 55652967.

It is an arithmetic number, because the mean of its divisors is an integer number (32511348000).

Almost surely, 2^999978000522 is an apocalyptic number.

999978000522 is an abundant number, since it is smaller than the sum of its proper divisors (1080748271478).

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

999978000522 is a wasteful number, since it uses less digits than its factorization.

999978000522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19811.

The product of its (nonzero) digits is 7348320, while the sum is 60.

The spelling of 999978000522 in words is "nine hundred ninety-nine billion, nine hundred seventy-eight million, five hundred twenty-two", and thus it is an aban number.