1649564681737 has 16 divisors (see below), whose sum is σ = 1947810952192. Its totient is φ = 1367050426560.

The previous prime is 1649564681711. The next prime is 1649564681747. The reversal of 1649564681737 is 7371864659461.

It is a de Polignac number, because none of the positive numbers 2^k-1649564681737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1649564681747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3240258 + ... + 3714619.

It is an arithmetic number, because the mean of its divisors is an integer number (121738184512).

Almost surely, 2^{1649564681737} is an apocalyptic number.

It is an amenable number.

1649564681737 is a deficient number, since it is larger than the sum of its proper divisors (298246270455).

1649564681737 is a wasteful number, since it uses less digits than its factorization.

1649564681737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6956008.

The product of its digits is 182891520, while the sum is 67.

The spelling of 1649564681737 in words is "one trillion, six hundred forty-nine billion, five hundred sixty-four million, six hundred eighty-one thousand, seven hundred thirty-seven".