16161651111111 has 16 divisors (see below), whose sum is σ = 23507924820480. Its totient is φ = 9794911459520.

The previous prime is 16161651111083. The next prime is 16161651111113. The reversal of 16161651111111 is 11111115616161.

It is not a de Polignac number, because 16161651111111 - 2¹⁴ = 16161651094727 is a prime.

It is a super-2 number, since 2×16161651111111² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16161651111113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18302386 + ... + 19165088.

It is an arithmetic number, because the mean of its divisors is an integer number (1469245301280).

Almost surely, 2^{16161651111111} is an apocalyptic number.

16161651111111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16161651111111 is a deficient number, since it is larger than the sum of its proper divisors (7346273709369).

16161651111111 is a wasteful number, since it uses less digits than its factorization.

16161651111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430406.

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

Adding to 16161651111111 its reverse (11111115616161), we get a palindrome (27272766727272).

The spelling of 16161651111111 in words is "sixteen trillion, one hundred sixty-one billion, six hundred fifty-one million, one hundred eleven thousand, one hundred eleven".