37168721864 has 16 divisors (see below), whose sum is σ = 69693417420. Its totient is φ = 18583810560.

The previous prime is 37168721839. The next prime is 37168721869. The reversal of 37168721864 is 46812786173.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 36637788100 + 530933764 = 191410^2 + 23042^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (37168721869) 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, 436724 + ... + 514844.

Almost surely, 2^37168721864 is an apocalyptic number.

It is an amenable number.

37168721864 is a deficient number, since it is larger than the sum of its proper divisors (32524695556).

37168721864 is a wasteful number, since it uses less digits than its factorization.

37168721864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137600 (or 137596 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 53.

The spelling of 37168721864 in words is "thirty-seven billion, one hundred sixty-eight million, seven hundred twenty-one thousand, eight hundred sixty-four".