166291654127 has 2 divisors, whose sum is σ = 166291654128. Its totient is φ = 166291654126.

The previous prime is 166291654103. The next prime is 166291654157. The reversal of 166291654127 is 721456192661.

It is a weak prime.

It is an emirp because it is prime and its reverse (721456192661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166291654127 is a prime.

It is a super-2 number, since 2×166291654127² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166291654157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83145827063 + 83145827064.

It is an arithmetic number, because the mean of its divisors is an integer number (83145827064).

Almost surely, 2^166291654127 is an apocalyptic number.

166291654127 is a deficient number, since it is larger than the sum of its proper divisors (1).

166291654127 is an equidigital number, since it uses as much as digits as its factorization.

166291654127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 50.

The spelling of 166291654127 in words is "one hundred sixty-six billion, two hundred ninety-one million, six hundred fifty-four thousand, one hundred twenty-seven".