166656021615151 has 2 divisors, whose sum is σ = 166656021615152. Its totient is φ = 166656021615150.

The previous prime is 166656021615119. The next prime is 166656021615157. The reversal of 166656021615151 is 151516120656661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166656021615151 - 2⁵ = 166656021615119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166656021615157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83328010807575 + 83328010807576.

It is an arithmetic number, because the mean of its divisors is an integer number (83328010807576).

Almost surely, 2^{166656021615151} is an apocalyptic number.

166656021615151 is a deficient number, since it is larger than the sum of its proper divisors (1).

166656021615151 is an equidigital number, since it uses as much as digits as its factorization.

166656021615151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944000, while the sum is 52.

The spelling of 166656021615151 in words is "one hundred sixty-six trillion, six hundred fifty-six billion, twenty-one million, six hundred fifteen thousand, one hundred fifty-one".