70991208511 has 4 divisors (see below), whose sum is σ = 71005734000. Its totient is φ = 70976683024.

The previous prime is 70991208499. The next prime is 70991208521. The reversal of 70991208511 is 11580219907.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11580219907 = 281 ⋅41210747.

It is a cyclic number.

It is not a de Polignac number, because 70991208511 - 2¹⁵ = 70991175743 is a prime.

It is a super-3 number, since 3×70991208511³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70991208521) 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, 7255411 + ... + 7265188.

It is an arithmetic number, because the mean of its divisors is an integer number (17751433500).

Almost surely, 2^70991208511 is an apocalyptic number.

70991208511 is a deficient number, since it is larger than the sum of its proper divisors (14525489).

70991208511 is a wasteful number, since it uses less digits than its factorization.

70991208511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14525488.

The product of its (nonzero) digits is 45360, while the sum is 43.

The spelling of 70991208511 in words is "seventy billion, nine hundred ninety-one million, two hundred eight thousand, five hundred eleven".