121156165166 has 4 divisors (see below), whose sum is σ = 181734247752. Its totient is φ = 60578082582.

The previous prime is 121156165133. The next prime is 121156165201. The reversal of 121156165166 is 661561651121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30289041290 + ... + 30289041293.

It is an arithmetic number, because the mean of its divisors is an integer number (45433561938).

Almost surely, 2^121156165166 is an apocalyptic number.

121156165166 is a deficient number, since it is larger than the sum of its proper divisors (60578082586).

121156165166 is an equidigital number, since it uses as much as digits as its factorization.

121156165166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60578082585.

The product of its digits is 64800, while the sum is 41.

The spelling of 121156165166 in words is "one hundred twenty-one billion, one hundred fifty-six million, one hundred sixty-five thousand, one hundred sixty-six".