991606000442 has 8 divisors (see below), whose sum is σ = 1487416872000. Its totient is φ = 495800376444.

The previous prime is 991606000439. The next prime is 991606000543. The reversal of 991606000442 is 244000606199.

991606000442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×991606000442² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 991606000442.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799442 + ... + 1619357.

It is an arithmetic number, because the mean of its divisors is an integer number (185927109000).

Almost surely, 2^991606000442 is an apocalyptic number.

991606000442 is a deficient number, since it is larger than the sum of its proper divisors (495810871558).

991606000442 is a wasteful number, since it uses less digits than its factorization.

991606000442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623780.

The product of its (nonzero) digits is 93312, while the sum is 41.

The spelling of 991606000442 in words is "nine hundred ninety-one billion, six hundred six million, four hundred forty-two", and thus it is an aban number.