1672266000781 has 2 divisors, whose sum is σ = 1672266000782. Its totient is φ = 1672266000780.

The previous prime is 1672266000739. The next prime is 1672266000829. The reversal of 1672266000781 is 1870006622761.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1663403472900 + 8862527881 = 1289730^2 + 94141^2 .

It is a cyclic number.

It is not a de Polignac number, because 1672266000781 - 2²⁵ = 1672232446349 is a prime.

It is a super-2 number, since 2×1672266000781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1672266004781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836133000390 + 836133000391.

It is an arithmetic number, because the mean of its divisors is an integer number (836133000391).

Almost surely, 2^{1672266000781} is an apocalyptic number.

It is an amenable number.

1672266000781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1672266000781 is an equidigital number, since it uses as much as digits as its factorization.

1672266000781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 1672266000781 in words is "one trillion, six hundred seventy-two billion, two hundred sixty-six million, seven hundred eighty-one", and thus it is an aban number.