16161111550001 has 4 divisors (see below), whose sum is σ = 17630303509104. Its totient is φ = 14691919590900.

The previous prime is 16161111549997. The next prime is 16161111550033. The reversal of 16161111550001 is 10005511116161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16161111550001 - 2² = 16161111549997 is a prime.

It is a super-2 number, since 2×16161111550001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16161111550061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 734595979535 + ... + 734595979556.

It is an arithmetic number, because the mean of its divisors is an integer number (4407575877276).

Almost surely, 2^{16161111550001} is an apocalyptic number.

16161111550001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16161111550001 is a deficient number, since it is larger than the sum of its proper divisors (1469191959103).

16161111550001 is a wasteful number, since it uses less digits than its factorization.

16161111550001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469191959102.

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

Adding to 16161111550001 its reverse (10005511116161), we get a palindrome (26166622666162).

The spelling of 16161111550001 in words is "sixteen trillion, one hundred sixty-one billion, one hundred eleven million, five hundred fifty thousand, one".