37551745921 has 2 divisors, whose sum is σ = 37551745922. Its totient is φ = 37551745920.

The previous prime is 37551745883. The next prime is 37551745937. The reversal of 37551745921 is 12954715573.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29297114896 + 8254631025 = 171164^2 + 90855^2 .

It is an emirp because it is prime and its reverse (12954715573) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37551745921 - 2¹⁹ = 37551221633 is a prime.

It is not a weakly prime, because it can be changed into another prime (37551745991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18775872960 + 18775872961.

It is an arithmetic number, because the mean of its divisors is an integer number (18775872961).

Almost surely, 2^37551745921 is an apocalyptic number.

It is an amenable number.

37551745921 is a deficient number, since it is larger than the sum of its proper divisors (1).

37551745921 is an equidigital number, since it uses as much as digits as its factorization.

37551745921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1323000, while the sum is 49.

The spelling of 37551745921 in words is "thirty-seven billion, five hundred fifty-one million, seven hundred forty-five thousand, nine hundred twenty-one".