37866066640 has 20 divisors (see below), whose sum is σ = 88038605124. Its totient is φ = 15146426624.

The previous prime is 37866066631. The next prime is 37866066649. The reversal of 37866066640 is 4666066873.

It is an interprime number because it is at equal distance from previous prime (37866066631) and next prime (37866066649).

It can be written as a sum of positive squares in 2 ways, for example, as 26763651216 + 11102415424 = 163596^2 + 105368^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37866066649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236662837 + ... + 236662996.

Almost surely, 2^37866066640 is an apocalyptic number.

It is an amenable number.

37866066640 is an abundant number, since it is smaller than the sum of its proper divisors (50172538484).

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

37866066640 is a wasteful number, since it uses less digits than its factorization.

37866066640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473325846 (or 473325840 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 52.

The spelling of 37866066640 in words is "thirty-seven billion, eight hundred sixty-six million, sixty-six thousand, six hundred forty".