1601616016961 has 4 divisors (see below), whose sum is σ = 1601619033300. Its totient is φ = 1601613000624.

The previous prime is 1601616016937. The next prime is 1601616016967. The reversal of 1601616016961 is 1696106161061.

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 363223182400 + 1238392834561 = 602680^2 + 1112831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1601616016961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601616016967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476426 + ... + 1852083.

It is an arithmetic number, because the mean of its divisors is an integer number (400404758325).

Almost surely, 2^{1601616016961} is an apocalyptic number.

It is an amenable number.

1601616016961 is a deficient number, since it is larger than the sum of its proper divisors (3016339).

1601616016961 is an equidigital number, since it uses as much as digits as its factorization.

1601616016961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016338.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 1601616016961 in words is "one trillion, six hundred one billion, six hundred sixteen million, sixteen thousand, nine hundred sixty-one".