128030691566 has 4 divisors (see below), whose sum is σ = 192046037352. Its totient is φ = 64015345782.

The previous prime is 128030691553. The next prime is 128030691647. The reversal of 128030691566 is 665196030821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 128030691566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32007672890 + ... + 32007672893.

It is an arithmetic number, because the mean of its divisors is an integer number (48011509338).

Almost surely, 2^128030691566 is an apocalyptic number.

128030691566 is a deficient number, since it is larger than the sum of its proper divisors (64015345786).

128030691566 is an equidigital number, since it uses as much as digits as its factorization.

128030691566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64015345785.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 128030691566 in words is "one hundred twenty-eight billion, thirty million, six hundred ninety-one thousand, five hundred sixty-six".