705640818553 has 4 divisors (see below), whose sum is σ = 769789983888. Its totient is φ = 641491653220.

The previous prime is 705640818527. The next prime is 705640818557. The reversal of 705640818553 is 355818046507.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 705640818553 - 2¹⁷ = 705640687481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 705640818553.

It is not an unprimeable number, because it can be changed into a prime (705640818557) 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, 32074582651 + ... + 32074582672.

It is an arithmetic number, because the mean of its divisors is an integer number (192447495972).

Almost surely, 2^705640818553 is an apocalyptic number.

It is an amenable number.

705640818553 is a deficient number, since it is larger than the sum of its proper divisors (64149165335).

705640818553 is a wasteful number, since it uses less digits than its factorization.

705640818553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64149165334.

The product of its (nonzero) digits is 4032000, while the sum is 52.

The spelling of 705640818553 in words is "seven hundred five billion, six hundred forty million, eight hundred eighteen thousand, five hundred fifty-three".