37534501621 has 2 divisors, whose sum is σ = 37534501622. Its totient is φ = 37534501620.

The previous prime is 37534501561. The next prime is 37534501633. The reversal of 37534501621 is 12610543573.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29306016100 + 8228485521 = 171190^2 + 90711^2 .

It is an emirp because it is prime and its reverse (12610543573) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37534501621 - 2¹¹ = 37534499573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37534501421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18767250810 + 18767250811.

It is an arithmetic number, because the mean of its divisors is an integer number (18767250811).

Almost surely, 2^37534501621 is an apocalyptic number.

It is an amenable number.

37534501621 is a deficient number, since it is larger than the sum of its proper divisors (1).

37534501621 is an equidigital number, since it uses as much as digits as its factorization.

37534501621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 37534501621 in words is "thirty-seven billion, five hundred thirty-four million, five hundred one thousand, six hundred twenty-one".