37540205821 has 4 divisors (see below), whose sum is σ = 37616662944. Its totient is φ = 37463748700.

The previous prime is 37540205669. The next prime is 37540205839. The reversal of 37540205821 is 12850204573.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12850204573 = 4007 ⋅3206939.

It is a cyclic number.

It is not a de Polignac number, because 37540205821 - 2²¹ = 37538108669 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 (37540205861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38227825 + ... + 38228806.

It is an arithmetic number, because the mean of its divisors is an integer number (9404165736).

Almost surely, 2^37540205821 is an apocalyptic number.

It is an amenable number.

37540205821 is a deficient number, since it is larger than the sum of its proper divisors (76457123).

37540205821 is an equidigital number, since it uses as much as digits as its factorization.

37540205821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76457122.

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 37540205821 in words is "thirty-seven billion, five hundred forty million, two hundred five thousand, eight hundred twenty-one".