71705672306661 has 16 divisors (see below), whose sum is σ = 98458764825600. Its totient is φ = 46398692905968.

The previous prime is 71705672306629. The next prime is 71705672306663. The reversal of 71705672306661 is 16660327650717.

It is a happy number.

It is not a de Polignac number, because 71705672306661 - 2⁵ = 71705672306629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71705672306663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2564016351 + ... + 2564044316.

It is an arithmetic number, because the mean of its divisors is an integer number (6153672801600).

Almost surely, 2^{71705672306661} is an apocalyptic number.

It is an amenable number.

71705672306661 is a deficient number, since it is larger than the sum of its proper divisors (26753092518939).

71705672306661 is a wasteful number, since it uses less digits than its factorization.

71705672306661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128060808.

The product of its (nonzero) digits is 13335840, while the sum is 57.

The spelling of 71705672306661 in words is "seventy-one trillion, seven hundred five billion, six hundred seventy-two million, three hundred six thousand, six hundred sixty-one".