1165651001555 has 4 divisors (see below), whose sum is σ = 1398781201872. Its totient is φ = 932520801240.

The previous prime is 1165651001497. The next prime is 1165651001563. The reversal of 1165651001555 is 5551001565611.

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

It is not a de Polignac number, because 1165651001555 - 2⁶ = 1165651001491 is a prime.

It is a super-2 number, since 2×1165651001555² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116565100151 + ... + 116565100160.

It is an arithmetic number, because the mean of its divisors is an integer number (349695300468).

Almost surely, 2^{1165651001555} is an apocalyptic number.

1165651001555 is a deficient number, since it is larger than the sum of its proper divisors (233130200317).

1165651001555 is an equidigital number, since it uses as much as digits as its factorization.

1165651001555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233130200316.

The product of its (nonzero) digits is 112500, while the sum is 41.

The spelling of 1165651001555 in words is "one trillion, one hundred sixty-five billion, six hundred fifty-one million, one thousand, five hundred fifty-five".