1644550955 has 16 divisors (see below), whose sum is σ = 2011080960. Its totient is φ = 1290654048.

The previous prime is 1644550949. The next prime is 1644550987. The reversal of 1644550955 is 5590554461.

It is a cyclic number.

It is not a de Polignac number, because 1644550955 - 2⁶ = 1644550891 is a prime.

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, 142844 + ... + 153926.

It is an arithmetic number, because the mean of its divisors is an integer number (125692560).

Almost surely, 2^1644550955 is an apocalyptic number.

1644550955 is a deficient number, since it is larger than the sum of its proper divisors (366530005).

1644550955 is a wasteful number, since it uses less digits than its factorization.

1644550955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11650.

The product of its (nonzero) digits is 540000, while the sum is 44.

The square root of 1644550955 is about 40553.0634477841. The cubic root of 1644550955 is about 1180.3635179445.

The spelling of 1644550955 in words is "one billion, six hundred forty-four million, five hundred fifty thousand, nine hundred fifty-five".