37664347621 has 4 divisors (see below), whose sum is σ = 37669985100. Its totient is φ = 37658710144.

The previous prime is 37664347601. The next prime is 37664347663. The reversal of 37664347621 is 12674346673.

37664347621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19630812100 + 18033535521 = 140110^2 + 134289^2 .

It is a cyclic number.

It is not a de Polignac number, because 37664347621 - 2¹³ = 37664339429 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 (37664347601) 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, 2808706 + ... + 2822083.

It is an arithmetic number, because the mean of its divisors is an integer number (9417496275).

Almost surely, 2^37664347621 is an apocalyptic number.

It is an amenable number.

37664347621 is a deficient number, since it is larger than the sum of its proper divisors (5637479).

37664347621 is an equidigital number, since it uses as much as digits as its factorization.

37664347621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5637478.

The product of its digits is 3048192, while the sum is 49.

The spelling of 37664347621 in words is "thirty-seven billion, six hundred sixty-four million, three hundred forty-seven thousand, six hundred twenty-one".