71640666692646 has 16 divisors (see below), whose sum is σ = 145007614511424. Its totient is φ = 23592508709864.

The previous prime is 71640666692537. The next prime is 71640666692657. The reversal of 71640666692646 is 64629666604617.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 71928379716 + ... + 71928380711.

It is an arithmetic number, because the mean of its divisors is an integer number (9062975906964).

Almost surely, 2^{71640666692646} is an apocalyptic number.

71640666692646 is an abundant number, since it is smaller than the sum of its proper divisors (73366947818778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71640666692646 is a wasteful number, since it uses less digits than its factorization.

71640666692646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143856760515.

The product of its (nonzero) digits is 564350976, while the sum is 69.

The spelling of 71640666692646 in words is "seventy-one trillion, six hundred forty billion, six hundred sixty-six million, six hundred ninety-two thousand, six hundred forty-six".