161616511111110 has 64 divisors (see below), whose sum is σ = 423142646768640. Its totient is φ = 39179645838080.

The previous prime is 161616511111057. The next prime is 161616511111157. The reversal of 161616511111110 is 11111115616161.

It is a super-2 number, since 2×161616511111110² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186906019 + ... + 187768721.

It is an arithmetic number, because the mean of its divisors is an integer number (6611603855760).

Almost surely, 2^{161616511111110} is an apocalyptic number.

161616511111110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161616511111110 is an abundant number, since it is smaller than the sum of its proper divisors (261526135657530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161616511111110 is a wasteful number, since it uses less digits than its factorization.

161616511111110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430413.

The product of its (nonzero) digits is 1080, while the sum is 33.

Adding to 161616511111110 its reverse (11111115616161), we get a palindrome (172727626727271).

The spelling of 161616511111110 in words is "one hundred sixty-one trillion, six hundred sixteen billion, five hundred eleven million, one hundred eleven thousand, one hundred ten".