1165551550501 has 4 divisors (see below), whose sum is σ = 1255209362092. Its totient is φ = 1075893738912.

The previous prime is 1165551550489. The next prime is 1165551550507. The reversal of 1165551550501 is 1050551555611.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 150346185025 + 1015205365476 = 387745^2 + 1007574^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165551550501 - 2⁵ = 1165551550469 is a prime.

It is a super-4 number, since 4×1165551550501⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165551550507) 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, 44828905776 + ... + 44828905801.

It is an arithmetic number, because the mean of its divisors is an integer number (313802340523).

Almost surely, 2^{1165551550501} is an apocalyptic number.

It is an amenable number.

1165551550501 is a deficient number, since it is larger than the sum of its proper divisors (89657811591).

1165551550501 is an equidigital number, since it uses as much as digits as its factorization.

1165551550501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89657811590.

The product of its (nonzero) digits is 93750, while the sum is 40.

The spelling of 1165551550501 in words is "one trillion, one hundred sixty-five billion, five hundred fifty-one million, five hundred fifty thousand, five hundred one".