1165501661151 has 4 divisors (see below), whose sum is σ = 1554002214872. Its totient is φ = 777001107432.

The previous prime is 1165501661089. The next prime is 1165501661161. The reversal of 1165501661151 is 1511661055611.

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

It is not a de Polignac number, because 1165501661151 - 2²⁷ = 1165367443423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165501661161) 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, 194250276856 + ... + 194250276861.

It is an arithmetic number, because the mean of its divisors is an integer number (388500553718).

Almost surely, 2^{1165501661151} is an apocalyptic number.

1165501661151 is a deficient number, since it is larger than the sum of its proper divisors (388500553721).

1165501661151 is an equidigital number, since it uses as much as digits as its factorization.

1165501661151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388500553720.

The product of its (nonzero) digits is 27000, while the sum is 39.

The spelling of 1165501661151 in words is "one trillion, one hundred sixty-five billion, five hundred one million, six hundred sixty-one thousand, one hundred fifty-one".