345604621891 has 2 divisors, whose sum is σ = 345604621892. Its totient is φ = 345604621890.

The previous prime is 345604621847. The next prime is 345604621933. The reversal of 345604621891 is 198126406543.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 345604621891 - 2⁷ = 345604621763 is a prime.

It is not a weakly prime, because it can be changed into another prime (345604624891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172802310945 + 172802310946.

It is an arithmetic number, because the mean of its divisors is an integer number (172802310946).

Almost surely, 2^345604621891 is an apocalyptic number.

345604621891 is a deficient number, since it is larger than the sum of its proper divisors (1).

345604621891 is an equidigital number, since it uses as much as digits as its factorization.

345604621891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 345604621891 in words is "three hundred forty-five billion, six hundred four million, six hundred twenty-one thousand, eight hundred ninety-one".