385566319421 has 2 divisors, whose sum is σ = 385566319422. Its totient is φ = 385566319420.

The previous prime is 385566319403. The next prime is 385566319429. The reversal of 385566319421 is 124913665583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285007567321 + 100558752100 = 533861^2 + 317110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-385566319421 is a prime.

It is a super-2 number, since 2×385566319421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385566319429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192783159710 + 192783159711.

It is an arithmetic number, because the mean of its divisors is an integer number (192783159711).

Almost surely, 2^385566319421 is an apocalyptic number.

It is an amenable number.

385566319421 is a deficient number, since it is larger than the sum of its proper divisors (1).

385566319421 is an equidigital number, since it uses as much as digits as its factorization.

385566319421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 53.

The spelling of 385566319421 in words is "three hundred eighty-five billion, five hundred sixty-six million, three hundred nineteen thousand, four hundred twenty-one".