1643363457 has 16 divisors (see below), whose sum is σ = 2202742080. Its totient is φ = 1089795392.

The previous prime is 1643363443. The next prime is 1643363467. The reversal of 1643363457 is 7543633461.

It is a cyclic number.

It is not a de Polignac number, because 1643363457 - 2⁴ = 1643363441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1643363417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 577843 + ... + 580679.

It is an arithmetic number, because the mean of its divisors is an integer number (137671380).

Almost surely, 2^1643363457 is an apocalyptic number.

It is an amenable number.

1643363457 is a deficient number, since it is larger than the sum of its proper divisors (559378623).

1643363457 is a wasteful number, since it uses less digits than its factorization.

1643363457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3792.

The product of its digits is 544320, while the sum is 42.

The square root of 1643363457 is about 40538.4195177858. The cubic root of 1643363457 is about 1180.0793437503.

The spelling of 1643363457 in words is "one billion, six hundred forty-three million, three hundred sixty-three thousand, four hundred fifty-seven".