1611621344345 has 16 divisors (see below), whose sum is σ = 2000851180560. Its totient is φ = 1244703043584.

The previous prime is 1611621344309. The next prime is 1611621344363. The reversal of 1611621344345 is 5434431261161.

It can be written as a sum of positive squares in 8 ways, for example, as 177959953609 + 1433661390736 = 421853^2 + 1197356^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611621344345 - 2²⁴ = 1611604567129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 741929 + ... + 1942601.

It is an arithmetic number, because the mean of its divisors is an integer number (125053198785).

Almost surely, 2^{1611621344345} is an apocalyptic number.

It is an amenable number.

1611621344345 is a deficient number, since it is larger than the sum of its proper divisors (389229836215).

1611621344345 is a wasteful number, since it uses less digits than its factorization.

1611621344345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209964.

The product of its digits is 207360, while the sum is 41.

The spelling of 1611621344345 in words is "one trillion, six hundred eleven billion, six hundred twenty-one million, three hundred forty-four thousand, three hundred forty-five".