1165155651 has 16 divisors (see below), whose sum is σ = 1883080320. Its totient is φ = 706154760.

The previous prime is 1165155647. The next prime is 1165155679. The reversal of 1165155651 is 1565515611.

It is a happy number.

1165155651 is a `hidden beast` number, since 1 + 1 + 6 + 51 + 556 + 51 = 666.

It is not a de Polignac number, because 1165155651 - 2² = 1165155647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1165155631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1961245 + ... + 1961838.

It is an arithmetic number, because the mean of its divisors is an integer number (117692520).

Almost surely, 2^1165155651 is an apocalyptic number.

1165155651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1165155651 is a deficient number, since it is larger than the sum of its proper divisors (717924669).

1165155651 is a wasteful number, since it uses less digits than its factorization.

1165155651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3923103 (or 3923097 counting only the distinct ones).

The product of its digits is 22500, while the sum is 36.

The square root of 1165155651 is about 34134.3763821752. The cubic root of 1165155651 is about 1052.2719214356.

It can be divided in two parts, 1165 and 155651, that added together give a square (156816 = 396²).

The spelling of 1165155651 in words is "one billion, one hundred sixty-five million, one hundred fifty-five thousand, six hundred fifty-one".