1644046057 has 2 divisors, whose sum is σ = 1644046058. Its totient is φ = 1644046056.

The previous prime is 1644046051. The next prime is 1644046073. The reversal of 1644046057 is 7506404461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1089726121 + 554319936 = 33011^2 + 23544^2 .

It is a cyclic number.

It is not a de Polignac number, because 1644046057 - 2⁷ = 1644045929 is a prime.

It is a super-3 number, since 3×1644046057³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1644046051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822023028 + 822023029.

It is an arithmetic number, because the mean of its divisors is an integer number (822023029).

Almost surely, 2^1644046057 is an apocalyptic number.

It is an amenable number.

1644046057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644046057 is an equidigital number, since it uses as much as digits as its factorization.

1644046057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 1644046057 is about 40546.8378175167. The cubic root of 1644046057 is about 1180.2427100572.

The spelling of 1644046057 in words is "one billion, six hundred forty-four million, forty-six thousand, fifty-seven".