70991661721305 has 64 divisors (see below), whose sum is σ = 124276273712640. Its totient is φ = 34393795430400.

The previous prime is 70991661721297. The next prime is 70991661721307. The reversal of 70991661721305 is 50312716619907.

It is not a de Polignac number, because 70991661721305 - 2³ = 70991661721297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70991661721307) 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 63 ways as a sum of consecutive naturals, for example, 2751141 + ... + 12229149.

It is an arithmetic number, because the mean of its divisors is an integer number (1941816776760).

Almost surely, 2^{70991661721305} is an apocalyptic number.

It is an amenable number.

70991661721305 is a deficient number, since it is larger than the sum of its proper divisors (53284611991335).

70991661721305 is a wasteful number, since it uses less digits than its factorization.

70991661721305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9478642.

The product of its (nonzero) digits is 4286520, while the sum is 57.

The spelling of 70991661721305 in words is "seventy trillion, nine hundred ninety-one billion, six hundred sixty-one million, seven hundred twenty-one thousand, three hundred five".