7266057721669 has 2 divisors, whose sum is σ = 7266057721670. Its totient is φ = 7266057721668.

The previous prime is 7266057721639. The next prime is 7266057721739. The reversal of 7266057721669 is 9661277506627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7025627348100 + 240430373569 = 2650590^2 + 490337^2 .

It is a cyclic number.

It is not a de Polignac number, because 7266057721669 - 2²³ = 7266049333061 is a prime.

It is a super-2 number, since 2×7266057721669² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7266057721669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7266057721639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3633028860834 + 3633028860835.

It is an arithmetic number, because the mean of its divisors is an integer number (3633028860835).

Almost surely, 2^{7266057721669} is an apocalyptic number.

It is an amenable number.

7266057721669 is a deficient number, since it is larger than the sum of its proper divisors (1).

7266057721669 is an equidigital number, since it uses as much as digits as its factorization.

7266057721669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80015040, while the sum is 64.

The spelling of 7266057721669 in words is "seven trillion, two hundred sixty-six billion, fifty-seven million, seven hundred twenty-one thousand, six hundred sixty-nine".