1561729445774 has 8 divisors (see below), whose sum is σ = 2342600493240. Its totient is φ = 780862614696.

The previous prime is 1561729445747. The next prime is 1561729445833. The reversal of 1561729445774 is 4775449271651.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144452 + ... + 1773224.

It is an arithmetic number, because the mean of its divisors is an integer number (292825061655).

Almost surely, 2^{1561729445774} is an apocalyptic number.

1561729445774 is a deficient number, since it is larger than the sum of its proper divisors (780871047466).

1561729445774 is a wasteful number, since it uses less digits than its factorization.

1561729445774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108194.

The product of its digits is 59270400, while the sum is 62.

The spelling of 1561729445774 in words is "one trillion, five hundred sixty-one billion, seven hundred twenty-nine million, four hundred forty-five thousand, seven hundred seventy-four".