1616601011645 has 4 divisors (see below), whose sum is σ = 1939921213980. Its totient is φ = 1293280809312.

The previous prime is 1616601011629. The next prime is 1616601011653. The reversal of 1616601011645 is 5461101066161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 510565982521 + 1106035029124 = 714539^2 + 1051682^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616601011645 - 2⁴ = 1616601011629 is a prime.

It is a super-2 number, since 2×1616601011645² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1616601011599 and 1616601011608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161660101160 + ... + 161660101169.

It is an arithmetic number, because the mean of its divisors is an integer number (484980303495).

Almost surely, 2^{1616601011645} is an apocalyptic number.

It is an amenable number.

1616601011645 is a deficient number, since it is larger than the sum of its proper divisors (323320202335).

1616601011645 is an equidigital number, since it uses as much as digits as its factorization.

1616601011645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323320202334.

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 1616601011645 in words is "one trillion, six hundred sixteen billion, six hundred one million, eleven thousand, six hundred forty-five".