999672026897 has 2 divisors, whose sum is σ = 999672026898. Its totient is φ = 999672026896.

The previous prime is 999672026833. The next prime is 999672026929. The reversal of 999672026897 is 798620276999.

It is a happy number.

It is a Cunningham number, because it is equal to 999836²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 999672026896 + 1 = 999836^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 999672026897 - 2⁶ = 999672026833 is a prime.

It is a super-2 number, since 2×999672026897² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999671026897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499836013448 + 499836013449.

It is an arithmetic number, because the mean of its divisors is an integer number (499836013449).

Almost surely, 2^999672026897 is an apocalyptic number.

It is an amenable number.

999672026897 is a deficient number, since it is larger than the sum of its proper divisors (1).

999672026897 is an equidigital number, since it uses as much as digits as its factorization.

999672026897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 370355328, while the sum is 74.

The spelling of 999672026897 in words is "nine hundred ninety-nine billion, six hundred seventy-two million, twenty-six thousand, eight hundred ninety-seven".