71931465666 has 48 divisors (see below), whose sum is σ = 170130324000. Its totient is φ = 22715196768.

The previous prime is 71931465653. The next prime is 71931465673. The reversal of 71931465666 is 66656413917.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3885691 + ... + 3904158.

It is an arithmetic number, because the mean of its divisors is an integer number (3544381750).

Almost surely, 2^71931465666 is an apocalyptic number.

71931465666 is an abundant number, since it is smaller than the sum of its proper divisors (98198858334).

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

71931465666 is a wasteful number, since it uses less digits than its factorization.

71931465666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7789885 (or 7789873 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The spelling of 71931465666 in words is "seventy-one billion, nine hundred thirty-one million, four hundred sixty-five thousand, six hundred sixty-six".