71690238666 has 24 divisors (see below), whose sum is σ = 159526928964. Its totient is φ = 23250888000.

The previous prime is 71690238661. The next prime is 71690238667. The reversal of 71690238666 is 66683209617.

It can be written as a sum of positive squares in 2 ways, for example, as 57250611441 + 14439627225 = 239271^2 + 120165^2 .

It is not an unprimeable number, because it can be changed into a prime (71690238661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53820835 + ... + 53822166.

Almost surely, 2^71690238666 is an apocalyptic number.

71690238666 is an abundant number, since it is smaller than the sum of its proper divisors (87836690298).

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

71690238666 is a wasteful number, since it uses less digits than its factorization.

71690238666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107643046 (or 107643043 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 71690238666 in words is "seventy-one billion, six hundred ninety million, two hundred thirty-eight thousand, six hundred sixty-six".