1165405651 has 4 divisors (see below), whose sum is σ = 1192508152. Its totient is φ = 1138303152.

The previous prime is 1165405643. The next prime is 1165405669. The reversal of 1165405651 is 1565045611.

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

It is a cyclic number.

It is not a de Polignac number, because 1165405651 - 2³ = 1165405643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165405601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13551186 + ... + 13551271.

It is an arithmetic number, because the mean of its divisors is an integer number (298127038).

Almost surely, 2^1165405651 is an apocalyptic number.

1165405651 is a deficient number, since it is larger than the sum of its proper divisors (27102501).

1165405651 is an equidigital number, since it uses as much as digits as its factorization.

1165405651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27102500.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 1165405651 is about 34138.0381832348. The cubic root of 1165405651 is about 1052.3471758068.

The spelling of 1165405651 in words is "one billion, one hundred sixty-five million, four hundred five thousand, six hundred fifty-one".