31085997668 has 24 divisors (see below), whose sum is σ = 61926258240. Its totient is φ = 13515650720.

The previous prime is 31085997661. The next prime is 31085997673. The reversal of 31085997668 is 86679958013.

It is a happy number.

It is a super-3 number, since 3×31085997668³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31085997668.

It is not an unprimeable number, because it can be changed into a prime (31085997661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15357683 + ... + 15359706.

It is an arithmetic number, because the mean of its divisors is an integer number (2580260760).

Almost surely, 2^31085997668 is an apocalyptic number.

It is an amenable number.

31085997668 is a deficient number, since it is larger than the sum of its proper divisors (30840260572).

31085997668 is a wasteful number, since it uses less digits than its factorization.

31085997668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30717427 (or 30717425 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 62.

The spelling of 31085997668 in words is "thirty-one billion, eighty-five million, nine hundred ninety-seven thousand, six hundred sixty-eight".