1161665427 has 32 divisors (see below), whose sum is σ = 1694343168. Its totient is φ = 703662336.

The previous prime is 1161665419. The next prime is 1161665447. The reversal of 1161665427 is 7245661611.

It is not a de Polignac number, because 1161665427 - 2³ = 1161665419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1161665447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1239303 + ... + 1240239.

It is an arithmetic number, because the mean of its divisors is an integer number (52948224).

Almost surely, 2^1161665427 is an apocalyptic number.

1161665427 is a deficient number, since it is larger than the sum of its proper divisors (532677741).

1161665427 is a wasteful number, since it uses less digits than its factorization.

1161665427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419.

The product of its digits is 60480, while the sum is 39.

The square root of 1161665427 is about 34083.2132728122. The cubic root of 1161665427 is about 1051.2201769805.

The spelling of 1161665427 in words is "one billion, one hundred sixty-one million, six hundred sixty-five thousand, four hundred twenty-seven".