128154237817 has 4 divisors (see below), whose sum is σ = 130880923776. Its totient is φ = 125427551860.

The previous prime is 128154237781. The next prime is 128154237847. The reversal of 128154237817 is 718732451821.

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 128154237817 - 2⁷ = 128154237689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128154237847) 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, 1363342909 + ... + 1363343002.

It is an arithmetic number, because the mean of its divisors is an integer number (32720230944).

Almost surely, 2^128154237817 is an apocalyptic number.

It is an amenable number.

128154237817 is a deficient number, since it is larger than the sum of its proper divisors (2726685959).

128154237817 is an equidigital number, since it uses as much as digits as its factorization.

128154237817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2726685958.

The product of its digits is 752640, while the sum is 49.

The spelling of 128154237817 in words is "one hundred twenty-eight billion, one hundred fifty-four million, two hundred thirty-seven thousand, eight hundred seventeen".