71916466609 has 16 divisors (see below), whose sum is σ = 78735116880. Its totient is φ = 65282088960.

The previous prime is 71916466607. The next prime is 71916466627. The reversal of 71916466609 is 90666461917.

It can be written as a sum of positive squares in 8 ways, for example, as 56704944384 + 15211522225 = 238128^2 + 123335^2 .

It is a cyclic number.

It is not a de Polignac number, because 71916466609 - 2¹ = 71916466607 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 71916466609.

It is not an unprimeable number, because it can be changed into a prime (71916466603) 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, 6002577 + ... + 6014545.

It is an arithmetic number, because the mean of its divisors is an integer number (4920944805).

Almost surely, 2^71916466609 is an apocalyptic number.

It is an amenable number.

71916466609 is a deficient number, since it is larger than the sum of its proper divisors (6818650271).

71916466609 is a wasteful number, since it uses less digits than its factorization.

71916466609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19620.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 71916466609 in words is "seventy-one billion, nine hundred sixteen million, four hundred sixty-six thousand, six hundred nine".