1616001561011 has 8 divisors (see below), whose sum is σ = 1672060716480. Its totient is φ = 1559964736512.

The previous prime is 1616001561007. The next prime is 1616001561037. The reversal of 1616001561011 is 1101651006161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1616001561011 - 2² = 1616001561007 is a prime.

It is a super-2 number, since 2×1616001561011² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1616001561071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5435435 + ... + 5725028.

It is an arithmetic number, because the mean of its divisors is an integer number (209007589560).

Almost surely, 2^{1616001561011} is an apocalyptic number.

1616001561011 is a deficient number, since it is larger than the sum of its proper divisors (56059155469).

1616001561011 is a wasteful number, since it uses less digits than its factorization.

1616001561011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11165485.

The product of its (nonzero) digits is 1080, while the sum is 29.

Adding to 1616001561011 its reverse (1101651006161), we get a palindrome (2717652567172).

The spelling of 1616001561011 in words is "one trillion, six hundred sixteen billion, one million, five hundred sixty-one thousand, eleven".