37770612821 has 2 divisors, whose sum is σ = 37770612822. Its totient is φ = 37770612820.

The previous prime is 37770612809. The next prime is 37770612853. The reversal of 37770612821 is 12821607773.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19325170225 + 18445442596 = 139015^2 + 135814^2 .

It is a cyclic number.

It is not a de Polignac number, because 37770612821 - 2⁶ = 37770612757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37770612871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18885306410 + 18885306411.

It is an arithmetic number, because the mean of its divisors is an integer number (18885306411).

Almost surely, 2^37770612821 is an apocalyptic number.

It is an amenable number.

37770612821 is a deficient number, since it is larger than the sum of its proper divisors (1).

37770612821 is an equidigital number, since it uses as much as digits as its factorization.

37770612821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 197568, while the sum is 44.

The spelling of 37770612821 in words is "thirty-seven billion, seven hundred seventy million, six hundred twelve thousand, eight hundred twenty-one".