1212161660166 has 16 divisors (see below), whose sum is σ = 2551919284800. Its totient is φ = 382787892648.

The previous prime is 1212161660153. The next prime is 1212161660179. The reversal of 1212161660166 is 6610661612121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1212161660153) and next prime (1212161660179).

It is a super-2 number, since 2×1212161660166² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5316498396 + ... + 5316498623.

It is an arithmetic number, because the mean of its divisors is an integer number (159494955300).

Almost surely, 2^{1212161660166} is an apocalyptic number.

1212161660166 is an abundant number, since it is smaller than the sum of its proper divisors (1339757624634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212161660166 is a wasteful number, since it uses less digits than its factorization.

1212161660166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10632997043.

The product of its (nonzero) digits is 31104, while the sum is 39.

The spelling of 1212161660166 in words is "one trillion, two hundred twelve billion, one hundred sixty-one million, six hundred sixty thousand, one hundred sixty-six".