1667791154081 has 16 divisors (see below), whose sum is σ = 1814167904640. Its totient is φ = 1524008666880.

The previous prime is 1667791154063. The next prime is 1667791154137. The reversal of 1667791154081 is 1804511977661.

It is a cyclic number.

It is not a de Polignac number, because 1667791154081 - 2¹⁰ = 1667791153057 is a prime.

It is a super-2 number, since 2×1667791154081² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1667791154011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3553721 + ... + 3995561.

It is an arithmetic number, because the mean of its divisors is an integer number (113385494040).

Almost surely, 2^{1667791154081} is an apocalyptic number.

It is an amenable number.

1667791154081 is a deficient number, since it is larger than the sum of its proper divisors (146376750559).

1667791154081 is a wasteful number, since it uses less digits than its factorization.

1667791154081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444776.

The product of its (nonzero) digits is 2540160, while the sum is 56.

The spelling of 1667791154081 in words is "one trillion, six hundred sixty-seven billion, seven hundred ninety-one million, one hundred fifty-four thousand, eighty-one".