1201066155 has 24 divisors (see below), whose sum is σ = 2086231680. Its totient is φ = 639219840.

The previous prime is 1201066147. The next prime is 1201066189. The reversal of 1201066155 is 5516601021.

It is a happy number.

It is not a de Polignac number, because 1201066155 - 2³ = 1201066147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6306 + ... + 49415.

It is an arithmetic number, because the mean of its divisors is an integer number (86926320).

Almost surely, 2^1201066155 is an apocalyptic number.

1201066155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1201066155 is a deficient number, since it is larger than the sum of its proper divisors (885165525).

1201066155 is a wasteful number, since it uses less digits than its factorization.

1201066155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56211 (or 56208 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1201066155 is about 34656.4013567479. The cubic root of 1201066155 is about 1062.9731867887.

Adding to 1201066155 its reverse (5516601021), we get a palindrome (6717667176).

The spelling of 1201066155 in words is "one billion, two hundred one million, sixty-six thousand, one hundred fifty-five".