345550677721 has 2 divisors, whose sum is σ = 345550677722. Its totient is φ = 345550677720.

The previous prime is 345550677709. The next prime is 345550677733. The reversal of 345550677721 is 127776055543.

It is a balanced prime because it is at equal distance from previous prime (345550677709) and next prime (345550677733).

It can be written as a sum of positive squares in only one way, i.e., 345015264400 + 535413321 = 587380^2 + 23139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345550677721 is a prime.

It is not a weakly prime, because it can be changed into another prime (345550677781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172775338860 + 172775338861.

It is an arithmetic number, because the mean of its divisors is an integer number (172775338861).

Almost surely, 2^345550677721 is an apocalyptic number.

It is an amenable number.

345550677721 is a deficient number, since it is larger than the sum of its proper divisors (1).

345550677721 is an equidigital number, since it uses as much as digits as its factorization.

345550677721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6174000, while the sum is 52.

The spelling of 345550677721 in words is "three hundred forty-five billion, five hundred fifty million, six hundred seventy-seven thousand, seven hundred twenty-one".