1661316034650 has 48 divisors (see below), whose sum is σ = 4120342111584. Its totient is φ = 442987679680.

The previous prime is 1661316034571. The next prime is 1661316034657. The reversal of 1661316034650 is 564306131661.

It is not an unprimeable number, because it can be changed into a prime (1661316034657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1899484 + ... + 2632616.

It is an arithmetic number, because the mean of its divisors is an integer number (85840460658).

Almost surely, 2^{1661316034650} is an apocalyptic number.

1661316034650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661316034650 is an abundant number, since it is smaller than the sum of its proper divisors (2459026076934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661316034650 is a wasteful number, since it uses less digits than its factorization.

1661316034650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748255 (or 748250 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 1661316034650 in words is "one trillion, six hundred sixty-one billion, three hundred sixteen million, thirty-four thousand, six hundred fifty".