128915307733 has 4 divisors (see below), whose sum is σ = 129061305568. Its totient is φ = 128769309900.

The previous prime is 128915307713. The next prime is 128915307791. The reversal of 128915307733 is 337703519821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128915307733 - 2¹⁷ = 128915176661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128915307713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72997593 + ... + 72999358.

It is an arithmetic number, because the mean of its divisors is an integer number (32265326392).

Almost surely, 2^128915307733 is an apocalyptic number.

It is an amenable number.

128915307733 is a deficient number, since it is larger than the sum of its proper divisors (145997835).

128915307733 is an equidigital number, since it uses as much as digits as its factorization.

128915307733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145997834.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 128915307733 in words is "one hundred twenty-eight billion, nine hundred fifteen million, three hundred seven thousand, seven hundred thirty-three".