1649670081 has 8 divisors (see below), whose sum is σ = 2199759744. Its totient is φ = 1099680240.

The previous prime is 1649670073. The next prime is 1649670083. The reversal of 1649670081 is 1800769461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1649670081 - 2³ = 1649670073 is a prime.

It is a super-2 number, since 2×1649670081² = 5442822752293093122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1649670083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32520 + ... + 66006.

It is an arithmetic number, because the mean of its divisors is an integer number (274969968).

Almost surely, 2^1649670081 is an apocalyptic number.

It is an amenable number.

1649670081 is a deficient number, since it is larger than the sum of its proper divisors (550089663).

1649670081 is a wasteful number, since it uses less digits than its factorization.

1649670081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49911.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1649670081 is about 40616.1307979970. The cubic root of 1649670081 is about 1181.5869868373.

The spelling of 1649670081 in words is "one billion, six hundred forty-nine million, six hundred seventy thousand, eighty-one".