1649895605 has 8 divisors (see below), whose sum is σ = 1988754432. Its totient is φ = 1313996688.

The previous prime is 1649895587. The next prime is 1649895619. The reversal of 1649895605 is 5065989461.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1649895605 - 2⁸ = 1649895349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 738749 + ... + 740978.

It is an arithmetic number, because the mean of its divisors is an integer number (248594304).

Almost surely, 2^1649895605 is an apocalyptic number.

It is an amenable number.

1649895605 is a deficient number, since it is larger than the sum of its proper divisors (338858827).

1649895605 is a wasteful number, since it uses less digits than its factorization.

1649895605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479955.

The product of its (nonzero) digits is 2332800, while the sum is 53.

The square root of 1649895605 is about 40618.9069892335. The cubic root of 1649895605 is about 1181.6408287306.

The spelling of 1649895605 in words is "one billion, six hundred forty-nine million, eight hundred ninety-five thousand, six hundred five".