645421162117 has 2 divisors, whose sum is σ = 645421162118. Its totient is φ = 645421162116.

The previous prime is 645421162069. The next prime is 645421162151. The reversal of 645421162117 is 711261124546.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633996545121 + 11424616996 = 796239^2 + 106886^2 .

It is a cyclic number.

It is not a de Polignac number, because 645421162117 - 2⁷ = 645421161989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645421162117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645421162187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322710581058 + 322710581059.

It is an arithmetic number, because the mean of its divisors is an integer number (322710581059).

Almost surely, 2^645421162117 is an apocalyptic number.

It is an amenable number.

645421162117 is a deficient number, since it is larger than the sum of its proper divisors (1).

645421162117 is an equidigital number, since it uses as much as digits as its factorization.

645421162117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The spelling of 645421162117 in words is "six hundred forty-five billion, four hundred twenty-one million, one hundred sixty-two thousand, one hundred seventeen".