991606000403 has 4 divisors (see below), whose sum is σ = 995936157840. Its totient is φ = 987275842968.

The previous prime is 991606000373. The next prime is 991606000439. The reversal of 991606000403 is 304000606199.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 991606000403 - 2¹⁶ = 991605934867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991606000703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2165078375 + ... + 2165078832.

It is an arithmetic number, because the mean of its divisors is an integer number (248984039460).

Almost surely, 2^991606000403 is an apocalyptic number.

991606000403 is a deficient number, since it is larger than the sum of its proper divisors (4330157437).

991606000403 is a wasteful number, since it uses less digits than its factorization.

991606000403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4330157436.

The product of its (nonzero) digits is 34992, while the sum is 38.

The spelling of 991606000403 in words is "nine hundred ninety-one billion, six hundred six million, four hundred three", and thus it is an aban number.