1667730878113 has 2 divisors, whose sum is σ = 1667730878114. Its totient is φ = 1667730878112.

The previous prime is 1667730878053. The next prime is 1667730878119. The reversal of 1667730878113 is 3118780377661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1089169838689 + 578561039424 = 1043633^2 + 760632^2 .

It is a cyclic number.

It is not a de Polignac number, because 1667730878113 - 2²⁹ = 1667194007201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1667730878119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833865439056 + 833865439057.

It is an arithmetic number, because the mean of its divisors is an integer number (833865439057).

Almost surely, 2^{1667730878113} is an apocalyptic number.

It is an amenable number.

1667730878113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667730878113 is an equidigital number, since it uses as much as digits as its factorization.

1667730878113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7112448, while the sum is 58.

The spelling of 1667730878113 in words is "one trillion, six hundred sixty-seven billion, seven hundred thirty million, eight hundred seventy-eight thousand, one hundred thirteen".