345643397861 has 2 divisors, whose sum is σ = 345643397862. Its totient is φ = 345643397860.

The previous prime is 345643397851. The next prime is 345643397867. The reversal of 345643397861 is 168793346543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212276740225 + 133366657636 = 460735^2 + 365194^2 .

It is a cyclic number.

It is not a de Polignac number, because 345643397861 - 2¹⁴ = 345643381477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 345643397861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345643397867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172821698930 + 172821698931.

It is an arithmetic number, because the mean of its divisors is an integer number (172821698931).

Almost surely, 2^345643397861 is an apocalyptic number.

It is an amenable number.

345643397861 is a deficient number, since it is larger than the sum of its proper divisors (1).

345643397861 is an equidigital number, since it uses as much as digits as its factorization.

345643397861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39191040, while the sum is 59.

The spelling of 345643397861 in words is "three hundred forty-five billion, six hundred forty-three million, three hundred ninety-seven thousand, eight hundred sixty-one".