1667730878053 has 2 divisors, whose sum is σ = 1667730878054. Its totient is φ = 1667730878052.

The previous prime is 1667730878027. The next prime is 1667730878113. The reversal of 1667730878053 is 3508780377661.

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., 1504307156004 + 163423722049 = 1226502^2 + 404257^2 .

It is a cyclic number.

It is not a de Polignac number, because 1667730878053 - 2⁹ = 1667730877541 is a prime.

It is a super-2 number, since 2×1667730878053² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1667730877982 and 1667730878000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1667730878453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833865439026 + 833865439027.

It is an arithmetic number, because the mean of its divisors is an integer number (833865439027).

Almost surely, 2^{1667730878053} is an apocalyptic number.

It is an amenable number.

1667730878053 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667730878053 is an equidigital number, since it uses as much as digits as its factorization.

1667730878053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35562240, while the sum is 61.

The spelling of 1667730878053 in words is "one trillion, six hundred sixty-seven billion, seven hundred thirty million, eight hundred seventy-eight thousand, fifty-three".