1661244769636 has 48 divisors (see below), whose sum is σ = 3169194434560. Its totient is φ = 759040515360.

The previous prime is 1661244769631. The next prime is 1661244769711. The reversal of 1661244769636 is 6369674421661.

It is not an unprimeable number, because it can be changed into a prime (1661244769631) 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 15 ways as a sum of consecutive naturals, for example, 425100 + ... + 1871683.

Almost surely, 2^{1661244769636} is an apocalyptic number.

It is an amenable number.

1661244769636 is a deficient number, since it is larger than the sum of its proper divisors (1507949664924).

1661244769636 is a wasteful number, since it uses less digits than its factorization.

1661244769636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297144 (or 2297142 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 61.

The spelling of 1661244769636 in words is "one trillion, six hundred sixty-one billion, two hundred forty-four million, seven hundred sixty-nine thousand, six hundred thirty-six".