71661699 has 32 divisors (see below), whose sum is σ = 109440000. Its totient is φ = 46321632.

The previous prime is 71661679. The next prime is 71661743. The reversal of 71661699 is 99616617.

It is not a de Polignac number, because 71661699 - 2⁷ = 71661571 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71661679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188892 + ... + 189270.

It is an arithmetic number, because the mean of its divisors is an integer number (3420000).

Almost surely, 2^71661699 is an apocalyptic number.

71661699 is a deficient number, since it is larger than the sum of its proper divisors (37778301).

71661699 is a wasteful number, since it uses less digits than its factorization.

71661699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584 (or 578 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 71661699 is about 8465.3233251897. The cubic root of 71661699 is about 415.3641725220.

The spelling of 71661699 in words is "seventy-one million, six hundred sixty-one thousand, six hundred ninety-nine".