31005036666 has 12 divisors (see below), whose sum is σ = 67177579482. Its totient is φ = 10335012216.

The previous prime is 31005036659. The next prime is 31005036677. The reversal of 31005036666 is 66663050013.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 30283308441 + 721728225 = 174021^2 + 26865^2 .

It is a super-2 number, since 2×31005036666² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31005036666.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 861251001 + ... + 861251036.

Almost surely, 2^31005036666 is an apocalyptic number.

31005036666 is an abundant number, since it is smaller than the sum of its proper divisors (36172542816).

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

31005036666 is a wasteful number, since it uses less digits than its factorization.

31005036666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722502045 (or 1722502042 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

Adding to 31005036666 its reverse (66663050013), we get a palindrome (97668086679).

The spelling of 31005036666 in words is "thirty-one billion, five million, thirty-six thousand, six hundred sixty-six".