70643908771 has 4 divisors (see below), whose sum is σ = 70649303472. Its totient is φ = 70638514072.

The previous prime is 70643908729. The next prime is 70643908781. The reversal of 70643908771 is 17780934607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17780934607 = 59 ⋅301371773.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70643908771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70643908711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2677660 + ... + 2703913.

It is an arithmetic number, because the mean of its divisors is an integer number (17662325868).

Almost surely, 2^70643908771 is an apocalyptic number.

70643908771 is a deficient number, since it is larger than the sum of its proper divisors (5394701).

70643908771 is a wasteful number, since it uses less digits than its factorization.

70643908771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5394700.

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 70643908771 in words is "seventy billion, six hundred forty-three million, nine hundred eight thousand, seven hundred seventy-one".