38387775641521 has 2 divisors, whose sum is σ = 38387775641522. Its totient is φ = 38387775641520.

The previous prime is 38387775641513. The next prime is 38387775641629. The reversal of 38387775641521 is 12514657778383.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33041067474496 + 5346708167025 = 5748136^2 + 2312295^2 .

It is a cyclic number.

It is not a de Polignac number, because 38387775641521 - 2³ = 38387775641513 is a prime.

It is not a weakly prime, because it can be changed into another prime (38387778641521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19193887820760 + 19193887820761.

It is an arithmetic number, because the mean of its divisors is an integer number (19193887820761).

Almost surely, 2^{38387775641521} is an apocalyptic number.

It is an amenable number.

38387775641521 is a deficient number, since it is larger than the sum of its proper divisors (1).

38387775641521 is an equidigital number, since it uses as much as digits as its factorization.

38387775641521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 237081600, while the sum is 67.

The spelling of 38387775641521 in words is "thirty-eight trillion, three hundred eighty-seven billion, seven hundred seventy-five million, six hundred forty-one thousand, five hundred twenty-one".