997319791995 has 16 divisors (see below), whose sum is σ = 1650736208160. Its totient is φ = 513562375424.

The previous prime is 997319791957. The next prime is 997319792003. The reversal of 997319791995 is 599197913799.

It is a cyclic number.

It is not a de Polignac number, because 997319791995 - 2¹⁴ = 997319775611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 997319791995.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1146344154 + ... + 1146345023.

It is an arithmetic number, because the mean of its divisors is an integer number (103171013010).

Almost surely, 2^997319791995 is an apocalyptic number.

997319791995 is a deficient number, since it is larger than the sum of its proper divisors (653416416165).

997319791995 is a wasteful number, since it uses less digits than its factorization.

997319791995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292689214.

The product of its digits is 390609135, while the sum is 78.

The spelling of 997319791995 in words is "nine hundred ninety-seven billion, three hundred nineteen million, seven hundred ninety-one thousand, nine hundred ninety-five".