637121767012 has 12 divisors (see below), whose sum is σ = 1115356674796. Its totient is φ = 318448431360.

The previous prime is 637121766989. The next prime is 637121767049. The reversal of 637121767012 is 210767121736.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 360355287616 + 276766479396 = 600296^2 + 526086^2 .

It is a super-2 number, since 2×637121767012² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 637121767012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28100289 + ... + 28122952.

Almost surely, 2^637121767012 is an apocalyptic number.

It is an amenable number.

637121767012 is a deficient number, since it is larger than the sum of its proper divisors (478234907784).

637121767012 is a wasteful number, since it uses less digits than its factorization.

637121767012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56226078 (or 56226076 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 43.

Adding to 637121767012 its reverse (210767121736), we get a palindrome (847888888748).

The spelling of 637121767012 in words is "six hundred thirty-seven billion, one hundred twenty-one million, seven hundred sixty-seven thousand, twelve".