1166156172 has 36 divisors (see below), whose sum is σ = 2991786616. Its totient is φ = 382916160.

The previous prime is 1166156129. The next prime is 1166156197. The reversal of 1166156172 is 2716516611.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 239329 + ... + 244152.

Almost surely, 2^1166156172 is an apocalyptic number.

1166156172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1166156172 is an abundant number, since it is smaller than the sum of its proper divisors (1825630444).

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

1166156172 is a wasteful number, since it uses less digits than its factorization.

1166156172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483558 (or 483553 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 1166156172 is about 34149.0288588124. The cubic root of 1166156172 is about 1052.5730311185.

The spelling of 1166156172 in words is "one billion, one hundred sixty-six million, one hundred fifty-six thousand, one hundred seventy-two".