38461611471821 has 2 divisors, whose sum is σ = 38461611471822. Its totient is φ = 38461611471820.

The previous prime is 38461611471797. The next prime is 38461611471823. The reversal of 38461611471821 is 12817411616483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23899289916100 + 14562321555721 = 4888690^2 + 3816061^2 .

It is a cyclic number.

It is not a de Polignac number, because 38461611471821 - 2¹⁸ = 38461611209677 is a prime.

Together with 38461611471823, 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 (38461611471823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19230805735910 + 19230805735911.

It is an arithmetic number, because the mean of its divisors is an integer number (19230805735911).

Almost surely, 2^{38461611471821} is an apocalyptic number.

It is an amenable number.

38461611471821 is a deficient number, since it is larger than the sum of its proper divisors (1).

38461611471821 is an equidigital number, since it uses as much as digits as its factorization.

38461611471821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 53.

The spelling of 38461611471821 in words is "thirty-eight trillion, four hundred sixty-one billion, six hundred eleven million, four hundred seventy-one thousand, eight hundred twenty-one".