1151551665 has 24 divisors (see below), whose sum is σ = 2177480448. Its totient is φ = 558327840.

The previous prime is 1151551663. The next prime is 1151551669. The reversal of 1151551665 is 5661551511.

It is a happy number.

It is not a de Polignac number, because 1151551665 - 2¹ = 1151551663 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1151551663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1162689 + ... + 1163678.

It is an arithmetic number, because the mean of its divisors is an integer number (90728352).

Almost surely, 2^1151551665 is an apocalyptic number.

1151551665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1151551665 is a deficient number, since it is larger than the sum of its proper divisors (1025928783).

1151551665 is a wasteful number, since it uses less digits than its factorization.

1151551665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326389 (or 2326386 counting only the distinct ones).

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

The square root of 1151551665 is about 33934.5202559282. The cubic root of 1151551665 is about 1048.1605481291.

The spelling of 1151551665 in words is "one billion, one hundred fifty-one million, five hundred fifty-one thousand, six hundred sixty-five".