128643540946 has 8 divisors (see below), whose sum is σ = 198180590220. Its totient is φ = 62583344208.

The previous prime is 128643540937. The next prime is 128643540967. The reversal of 128643540946 is 649045346821.

It can be written as a sum of positive squares in 2 ways, for example, as 128458444921 + 185096025 = 358411^2 + 13605^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 128643540893 and 128643540902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869213041 + ... + 869213188.

Almost surely, 2^128643540946 is an apocalyptic number.

128643540946 is a deficient number, since it is larger than the sum of its proper divisors (69537049274).

128643540946 is a wasteful number, since it uses less digits than its factorization.

128643540946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738426268.

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 128643540946 in words is "one hundred twenty-eight billion, six hundred forty-three million, five hundred forty thousand, nine hundred forty-six".