345621444209 has 2 divisors, whose sum is σ = 345621444210. Its totient is φ = 345621444208.

The previous prime is 345621444191. The next prime is 345621444229. The reversal of 345621444209 is 902444126543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 336751571809 + 8869872400 = 580303^2 + 94180^2 .

It is a cyclic number.

It is not a de Polignac number, because 345621444209 - 2⁸ = 345621443953 is a prime.

It is a super-2 number, since 2×345621444209² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 345621444209.

It is not a weakly prime, because it can be changed into another prime (345621444229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172810722104 + 172810722105.

It is an arithmetic number, because the mean of its divisors is an integer number (172810722105).

Almost surely, 2^345621444209 is an apocalyptic number.

It is an amenable number.

345621444209 is a deficient number, since it is larger than the sum of its proper divisors (1).

345621444209 is an equidigital number, since it uses as much as digits as its factorization.

345621444209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 345621444209 in words is "three hundred forty-five billion, six hundred twenty-one million, four hundred forty-four thousand, two hundred nine".