155166105659991 has 8 divisors (see below), whose sum is σ = 206888642640240. Its totient is φ = 103443819559872.

The previous prime is 155166105659927. The next prime is 155166105659993. The reversal of 155166105659991 is 199956501661551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155166105659991 - 2⁶ = 155166105659927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155166105659993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61272120 + ... + 63754253.

It is an arithmetic number, because the mean of its divisors is an integer number (25861080330030).

Almost surely, 2^{155166105659991} is an apocalyptic number.

155166105659991 is a deficient number, since it is larger than the sum of its proper divisors (51722536980249).

155166105659991 is a wasteful number, since it uses less digits than its factorization.

155166105659991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125440065.

The product of its (nonzero) digits is 98415000, while the sum is 69.

The spelling of 155166105659991 in words is "one hundred fifty-five trillion, one hundred sixty-six billion, one hundred five million, six hundred fifty-nine thousand, nine hundred ninety-one".