1155665651 has 16 divisors (see below), whose sum is σ = 1341255168. Its totient is φ = 975240000.

The previous prime is 1155665639. The next prime is 1155665669. The reversal of 1155665651 is 1565665511.

It is not a de Polignac number, because 1155665651 - 2⁶ = 1155665587 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1155665599 and 1155665608.

It is not an unprimeable number, because it can be changed into a prime (1155665681) 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, 512276 + ... + 514526.

It is an arithmetic number, because the mean of its divisors is an integer number (83828448).

Almost surely, 2^1155665651 is an apocalyptic number.

1155665651 is a deficient number, since it is larger than the sum of its proper divisors (185589517).

1155665651 is a wasteful number, since it uses less digits than its factorization.

1155665651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3362.

The product of its digits is 135000, while the sum is 41.

The square root of 1155665651 is about 33995.0827473622. The cubic root of 1155665651 is about 1049.4072696965.

The spelling of 1155665651 in words is "one billion, one hundred fifty-five million, six hundred sixty-five thousand, six hundred fifty-one".