415165820821 has 2 divisors, whose sum is σ = 415165820822. Its totient is φ = 415165820820.

The previous prime is 415165820813. The next prime is 415165820833. The reversal of 415165820821 is 128028561514.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392088868900 + 23076951921 = 626170^2 + 151911^2 .

It is a cyclic number.

It is not a de Polignac number, because 415165820821 - 2³ = 415165820813 is a prime.

It is a super-2 number, since 2×415165820821² (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 (415165820851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207582910410 + 207582910411.

It is an arithmetic number, because the mean of its divisors is an integer number (207582910411).

Almost surely, 2^415165820821 is an apocalyptic number.

It is an amenable number.

415165820821 is a deficient number, since it is larger than the sum of its proper divisors (1).

415165820821 is an equidigital number, since it uses as much as digits as its factorization.

415165820821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153600, while the sum is 43.

The spelling of 415165820821 in words is "four hundred fifteen billion, one hundred sixty-five million, eight hundred twenty thousand, eight hundred twenty-one".