643053623 has 2 divisors, whose sum is σ = 643053624. Its totient is φ = 643053622.

The previous prime is 643053581. The next prime is 643053637. The reversal of 643053623 is 326350346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643053623 - 2²⁰ = 642005047 is a prime.

It is a super-2 number, since 2×643053623² = 827035924106852258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643053623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643053683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321526811 + 321526812.

It is an arithmetic number, because the mean of its divisors is an integer number (321526812).

Almost surely, 2^643053623 is an apocalyptic number.

643053623 is a deficient number, since it is larger than the sum of its proper divisors (1).

643053623 is an equidigital number, since it uses as much as digits as its factorization.

643053623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 32.

The square root of 643053623 is about 25358.5019865133. The cubic root of 643053623 is about 863.1422918058.

The spelling of 643053623 in words is "six hundred forty-three million, fifty-three thousand, six hundred twenty-three".