37385697821 has 2 divisors, whose sum is σ = 37385697822. Its totient is φ = 37385697820.

The previous prime is 37385697803. The next prime is 37385697823. The reversal of 37385697821 is 12879658373.

It is a happy number.

37385697821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25430680900 + 11955016921 = 159470^2 + 109339^2 .

It is a cyclic number.

It is not a de Polignac number, because 37385697821 - 2¹⁰ = 37385696797 is a prime.

Together with 37385697823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37385697823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18692848910 + 18692848911.

It is an arithmetic number, because the mean of its divisors is an integer number (18692848911).

Almost surely, 2^37385697821 is an apocalyptic number.

It is an amenable number.

37385697821 is a deficient number, since it is larger than the sum of its proper divisors (1).

37385697821 is an equidigital number, since it uses as much as digits as its factorization.

37385697821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15240960, while the sum is 59.

The spelling of 37385697821 in words is "thirty-seven billion, three hundred eighty-five million, six hundred ninety-seven thousand, eight hundred twenty-one".