1649815855 has 16 divisors (see below), whose sum is σ = 2047518720. Its totient is φ = 1275404832.

The previous prime is 1649815831. The next prime is 1649815891. The reversal of 1649815855 is 5585189461.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1649815855 - 2⁵ = 1649815823 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25869 + ... + 62998.

It is an arithmetic number, because the mean of its divisors is an integer number (127969920).

Almost surely, 2^1649815855 is an apocalyptic number.

1649815855 is a deficient number, since it is larger than the sum of its proper divisors (397702865).

1649815855 is an equidigital number, since it uses as much as digits as its factorization.

1649815855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88998.

The product of its digits is 1728000, while the sum is 52.

The square root of 1649815855 is about 40617.9252916739. The cubic root of 1649815855 is about 1181.6217896726.

The spelling of 1649815855 in words is "one billion, six hundred forty-nine million, eight hundred fifteen thousand, eight hundred fifty-five".