1649985538 has 8 divisors (see below), whose sum is σ = 2497684860. Its totient is φ = 817423920.

The previous prime is 1649985529. The next prime is 1649985581. The reversal of 1649985538 is 8355899461.

It can be written as a sum of positive squares in 2 ways, for example, as 1317907809 + 332077729 = 36303^2 + 18223^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3784153 + ... + 3784588.

Almost surely, 2^1649985538 is an apocalyptic number.

1649985538 is a deficient number, since it is larger than the sum of its proper divisors (847699322).

1649985538 is a wasteful number, since it uses less digits than its factorization.

1649985538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7568852.

The product of its digits is 9331200, while the sum is 58.

The square root of 1649985538 is about 40620.0140078755. The cubic root of 1649985538 is about 1181.6622980837.

The spelling of 1649985538 in words is "one billion, six hundred forty-nine million, nine hundred eighty-five thousand, five hundred thirty-eight".