128512625807638 has 8 divisors (see below), whose sum is σ = 192967464912840. Its totient is φ = 64190137503360.

The previous prime is 128512625807623. The next prime is 128512625807647. The reversal of 128512625807638 is 836708526215821.

It is a happy number.

128512625807638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 128512625807638.

It is a congruent number.

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, 33087697803 + ... + 33087701686.

It is an arithmetic number, because the mean of its divisors is an integer number (24120933114105).

Almost surely, 2^{128512625807638} is an apocalyptic number.

128512625807638 is a deficient number, since it is larger than the sum of its proper divisors (64454839105202).

128512625807638 is an equidigital number, since it uses as much as digits as its factorization.

128512625807638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66175400462.

The product of its (nonzero) digits is 77414400, while the sum is 64.

The spelling of 128512625807638 in words is "one hundred twenty-eight trillion, five hundred twelve billion, six hundred twenty-five million, eight hundred seven thousand, six hundred thirty-eight".