1644254066 has 24 divisors (see below), whose sum is σ = 3052229184. Its totient is φ = 650473200.

The previous prime is 1644254057. The next prime is 1644254069. The reversal of 1644254066 is 6604524461.

It is a super-3 number, since 3×1644254066³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1644254069) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 345110 + ... + 349841.

It is an arithmetic number, because the mean of its divisors is an integer number (127176216).

Almost surely, 2^1644254066 is an apocalyptic number.

1644254066 is a deficient number, since it is larger than the sum of its proper divisors (1407975118).

1644254066 is a wasteful number, since it uses less digits than its factorization.

1644254066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694986 (or 694973 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 1644254066 is about 40549.4027822852. The cubic root of 1644254066 is about 1180.2924837545.

The spelling of 1644254066 in words is "one billion, six hundred forty-four million, two hundred fifty-four thousand, sixty-six".