37665666757 has 4 divisors (see below), whose sum is σ = 37666055020. Its totient is φ = 37665278496.

The previous prime is 37665666743. The next prime is 37665666763. The reversal of 37665666757 is 75766656673.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75766656673 = 2609 ⋅29040497.

It can be written as a sum of positive squares in 2 ways, for example, as 18110161476 + 19555505281 = 134574^2 + 139841^2 .

It is a cyclic number.

It is not a de Polignac number, because 37665666757 - 2⁷ = 37665666629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37665666707) 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, 90163 + ... + 288895.

It is an arithmetic number, because the mean of its divisors is an integer number (9416513755).

Almost surely, 2^37665666757 is an apocalyptic number.

It is an amenable number.

37665666757 is a deficient number, since it is larger than the sum of its proper divisors (388263).

37665666757 is a wasteful number, since it uses less digits than its factorization.

37665666757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388262.

The product of its digits is 200037600, while the sum is 64.

The spelling of 37665666757 in words is "thirty-seven billion, six hundred sixty-five million, six hundred sixty-six thousand, seven hundred fifty-seven".