37821770381 has 2 divisors, whose sum is σ = 37821770382. Its totient is φ = 37821770380.

The previous prime is 37821770341. The next prime is 37821770383. The reversal of 37821770381 is 18307712873.

37821770381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35995575625 + 1826194756 = 189725^2 + 42734^2 .

It is a cyclic number.

It is not a de Polignac number, because 37821770381 - 2¹⁰ = 37821769357 is a prime.

It is a super-2 number, since 2×37821770381² (a number of 22 digits) contains 22 as substring.

Together with 37821770383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37821770383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18910885190 + 18910885191.

It is an arithmetic number, because the mean of its divisors is an integer number (18910885191).

Almost surely, 2^37821770381 is an apocalyptic number.

It is an amenable number.

37821770381 is a deficient number, since it is larger than the sum of its proper divisors (1).

37821770381 is an equidigital number, since it uses as much as digits as its factorization.

37821770381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 47.

The spelling of 37821770381 in words is "thirty-seven billion, eight hundred twenty-one million, seven hundred seventy thousand, three hundred eighty-one".