71501620116666 has 16 divisors (see below), whose sum is σ = 143004618669024. Its totient is φ = 23833643632944.

The previous prime is 71501620116631. The next prime is 71501620116671. The reversal of 71501620116666 is 66661102610517.

It is a happy number.

It is a super-2 number, since 2×71501620116666² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56759880 + ... + 58005923.

It is an arithmetic number, because the mean of its divisors is an integer number (8937788666814).

Almost surely, 2^{71501620116666} is an apocalyptic number.

71501620116666 is an abundant number, since it is smaller than the sum of its proper divisors (71502998552358).

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

71501620116666 is a wasteful number, since it uses less digits than its factorization.

71501620116666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114869645.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 71501620116666 in words is "seventy-one trillion, five hundred one billion, six hundred twenty million, one hundred sixteen thousand, six hundred sixty-six".