37731077721 has 8 divisors (see below), whose sum is σ = 55897892960. Its totient is φ = 25154051796.

The previous prime is 37731077707. The next prime is 37731077773. The reversal of 37731077721 is 12777013773.

It is not a de Polignac number, because 37731077721 - 2¹⁴ = 37731061337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (37731077701) 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 7 ways as a sum of consecutive naturals, for example, 698723635 + ... + 698723688.

It is an arithmetic number, because the mean of its divisors is an integer number (6987236620).

Almost surely, 2^37731077721 is an apocalyptic number.

It is an amenable number.

37731077721 is a deficient number, since it is larger than the sum of its proper divisors (18166815239).

37731077721 is a wasteful number, since it uses less digits than its factorization.

37731077721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397447332 (or 1397447326 counting only the distinct ones).

The product of its (nonzero) digits is 302526, while the sum is 45.

The spelling of 37731077721 in words is "thirty-seven billion, seven hundred thirty-one million, seventy-seven thousand, seven hundred twenty-one".