1649164749381 has 16 divisors (see below), whose sum is σ = 2443524520320. Its totient is φ = 1099300298400.

The previous prime is 1649164749371. The next prime is 1649164749389. The reversal of 1649164749381 is 1839474619461.

1649164749381 is a `hidden beast` number, since 1 + 6 + 4 + 9 + 1 + 64 + 7 + 493 + 81 = 666.

It is not a de Polignac number, because 1649164749381 - 2⁶ = 1649164749317 is a prime.

It is a super-2 number, since 2×1649164749381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649164749389) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3756720 + ... + 4172681.

It is an arithmetic number, because the mean of its divisors is an integer number (152720282520).

Almost surely, 2^{1649164749381} is an apocalyptic number.

It is an amenable number.

1649164749381 is a deficient number, since it is larger than the sum of its proper divisors (794359770939).

1649164749381 is an equidigital number, since it uses as much as digits as its factorization.

1649164749381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7937113 (or 7937107 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The spelling of 1649164749381 in words is "one trillion, six hundred forty-nine billion, one hundred sixty-four million, seven hundred forty-nine thousand, three hundred eighty-one".