705601721005 has 4 divisors (see below), whose sum is σ = 846722065212. Its totient is φ = 564481376800.

The previous prime is 705601721003. The next prime is 705601721021. The reversal of 705601721005 is 500127106507.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 143002716649 + 562599004356 = 378157^2 + 750066^2 .

It is not a de Polignac number, because 705601721005 - 2¹ = 705601721003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705601721003) 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, 70560172096 + ... + 70560172105.

It is an arithmetic number, because the mean of its divisors is an integer number (211680516303).

Almost surely, 2^705601721005 is an apocalyptic number.

It is an amenable number.

705601721005 is a deficient number, since it is larger than the sum of its proper divisors (141120344207).

705601721005 is a wasteful number, since it uses less digits than its factorization.

705601721005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141120344206.

The product of its (nonzero) digits is 14700, while the sum is 34.

The spelling of 705601721005 in words is "seven hundred five billion, six hundred one million, seven hundred twenty-one thousand, five".