154661666191 has 2 divisors, whose sum is σ = 154661666192. Its totient is φ = 154661666190.

The previous prime is 154661666189. The next prime is 154661666239. The reversal of 154661666191 is 191666166451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 154661666191 - 2¹ = 154661666189 is a prime.

Together with 154661666189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154661666101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77330833095 + 77330833096.

It is an arithmetic number, because the mean of its divisors is an integer number (77330833096).

Almost surely, 2^154661666191 is an apocalyptic number.

154661666191 is a deficient number, since it is larger than the sum of its proper divisors (1).

154661666191 is an equidigital number, since it uses as much as digits as its factorization.

154661666191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 52.

The spelling of 154661666191 in words is "one hundred fifty-four billion, six hundred sixty-one million, six hundred sixty-six thousand, one hundred ninety-one".