666453345202061 has 2 divisors, whose sum is σ = 666453345202062. Its totient is φ = 666453345202060.

The previous prime is 666453345202033. The next prime is 666453345202069. The reversal of 666453345202061 is 160202543354666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 486697383765961 + 179755961436100 = 22061219^2 + 13407310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666453345202061 is a prime.

It is a super-2 number, since 2×666453345202061² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666453345201994 and 666453345202012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666453345202069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333226672601030 + 333226672601031.

It is an arithmetic number, because the mean of its divisors is an integer number (333226672601031).

Almost surely, 2^{666453345202061} is an apocalyptic number.

It is an amenable number.

666453345202061 is a deficient number, since it is larger than the sum of its proper divisors (1).

666453345202061 is an equidigital number, since it uses as much as digits as its factorization.

666453345202061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18662400, while the sum is 53.

The spelling of 666453345202061 in words is "six hundred sixty-six trillion, four hundred fifty-three billion, three hundred forty-five million, two hundred two thousand, sixty-one".