1649944763775 has 96 divisors (see below), whose sum is σ = 3778921228800. Its totient is φ = 685691308800.

The previous prime is 1649944763749. The next prime is 1649944763777. The reversal of 1649944763775 is 5773674499461.

It is a happy number.

1649944763775 is a `hidden beast` number, since 1 + 6 + 499 + 4 + 4 + 7 + 63 + 7 + 75 = 666.

It is not a de Polignac number, because 1649944763775 - 2¹⁵ = 1649944731007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649944763777) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15820510 + ... + 15924459.

It is an arithmetic number, because the mean of its divisors is an integer number (39363762800).

Almost surely, 2^{1649944763775} is an apocalyptic number.

1649944763775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1649944763775 is an abundant number, since it is smaller than the sum of its proper divisors (2128976465025).

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

1649944763775 is a wasteful number, since it uses less digits than its factorization.

1649944763775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31745006 (or 31744995 counting only the distinct ones).

The product of its digits is 960180480, while the sum is 72.

The spelling of 1649944763775 in words is "one trillion, six hundred forty-nine billion, nine hundred forty-four million, seven hundred sixty-three thousand, seven hundred seventy-five".