38045406521 has 2 divisors, whose sum is σ = 38045406522. Its totient is φ = 38045406520.

The previous prime is 38045406517. The next prime is 38045406577. The reversal of 38045406521 is 12560454083.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32639480896 + 5405925625 = 180664^2 + 73525^2 .

It is an emirp because it is prime and its reverse (12560454083) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38045406521 - 2² = 38045406517 is a prime.

It is not a weakly prime, because it can be changed into another prime (38045436521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19022703260 + 19022703261.

It is an arithmetic number, because the mean of its divisors is an integer number (19022703261).

Almost surely, 2^38045406521 is an apocalyptic number.

It is an amenable number.

38045406521 is a deficient number, since it is larger than the sum of its proper divisors (1).

38045406521 is an equidigital number, since it uses as much as digits as its factorization.

38045406521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 38045406521 in words is "thirty-eight billion, forty-five million, four hundred six thousand, five hundred twenty-one".