1161161502501 has 128 divisors (see below), whose sum is σ = 2128508928000. Its totient is φ = 543527285760.

The previous prime is 1161161502469. The next prime is 1161161502503. The reversal of 1161161502501 is 1052051611611.

It is not a de Polignac number, because 1161161502501 - 2⁵ = 1161161502469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161161502503) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 54893275 + ... + 54914423.

It is an arithmetic number, because the mean of its divisors is an integer number (16628976000).

Almost surely, 2^{1161161502501} is an apocalyptic number.

1161161502501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1161161502501 is a deficient number, since it is larger than the sum of its proper divisors (967347425499).

1161161502501 is a wasteful number, since it uses less digits than its factorization.

1161161502501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21619.

The product of its (nonzero) digits is 1800, while the sum is 30.

The spelling of 1161161502501 in words is "one trillion, one hundred sixty-one billion, one hundred sixty-one million, five hundred two thousand, five hundred one".