161500011101615 has 32 divisors (see below), whose sum is σ = 199032988625856. Its totient is φ = 125727772631040.

The previous prime is 161500011101587. The next prime is 161500011101617. The reversal of 161500011101615 is 516101110005161.

It is a happy number.

It is not a de Polignac number, because 161500011101615 - 2⁴⁰ = 160400499473839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161500011101617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149153819 + ... + 150232691.

It is an arithmetic number, because the mean of its divisors is an integer number (6219780894558).

Almost surely, 2^{161500011101615} is an apocalyptic number.

161500011101615 is a deficient number, since it is larger than the sum of its proper divisors (37532977524241).

161500011101615 is a wasteful number, since it uses less digits than its factorization.

161500011101615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080779.

The product of its (nonzero) digits is 900, while the sum is 29.

Adding to 161500011101615 its reverse (516101110005161), we get a palindrome (677601121106776).

The spelling of 161500011101615 in words is "one hundred sixty-one trillion, five hundred billion, eleven million, one hundred one thousand, six hundred fifteen".