999997672254781 has 2 divisors, whose sum is σ = 999997672254782. Its totient is φ = 999997672254780.

The previous prime is 999997672254751. The next prime is 999997672254811. The reversal of 999997672254781 is 187452276799999.

It is a balanced prime because it is at equal distance from previous prime (999997672254751) and next prime (999997672254811).

It can be written as a sum of positive squares in only one way, i.e., 639891410405625 + 360106261849156 = 25296075^2 + 18976466^2 .

It is a cyclic number.

It is not a de Polignac number, because 999997672254781 - 2¹⁵ = 999997672222013 is a prime.

It is a super-2 number, since 2×999997672254781² (a number of 31 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 999997672254781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999997672254751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998836127390 + 499998836127391.

It is an arithmetic number, because the mean of its divisors is an integer number (499998836127391).

Almost surely, 2^{999997672254781} is an apocalyptic number.

It is an amenable number.

999997672254781 is a deficient number, since it is larger than the sum of its proper divisors (1).

999997672254781 is an equidigital number, since it uses as much as digits as its factorization.

999997672254781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77774618880, while the sum is 94.

The spelling of 999997672254781 in words is "nine hundred ninety-nine trillion, nine hundred ninety-seven billion, six hundred seventy-two million, two hundred fifty-four thousand, seven hundred eighty-one".