31666042237 has 4 divisors (see below), whose sum is σ = 31666411036. Its totient is φ = 31665673440.

The previous prime is 31666042231. The next prime is 31666042253. The reversal of 31666042237 is 73224066613.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5033760601 + 26632281636 = 70949^2 + 163194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31666042237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31666042237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31666042231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19687 + ... + 252427.

It is an arithmetic number, because the mean of its divisors is an integer number (7916602759).

Almost surely, 2^31666042237 is an apocalyptic number.

It is an amenable number.

31666042237 is a deficient number, since it is larger than the sum of its proper divisors (368799).

31666042237 is a wasteful number, since it uses less digits than its factorization.

31666042237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368798.

The product of its (nonzero) digits is 217728, while the sum is 40.

The spelling of 31666042237 in words is "thirty-one billion, six hundred sixty-six million, forty-two thousand, two hundred thirty-seven".