128212969737 has 4 divisors (see below), whose sum is σ = 170950626320. Its totient is φ = 85475313156.

The previous prime is 128212969733. The next prime is 128212969757. The reversal of 128212969737 is 737969212821.

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 not a de Polignac number, because 128212969737 - 2² = 128212969733 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128212969733) 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, 21368828287 + ... + 21368828292.

It is an arithmetic number, because the mean of its divisors is an integer number (42737656580).

Almost surely, 2^128212969737 is an apocalyptic number.

It is an amenable number.

128212969737 is a deficient number, since it is larger than the sum of its proper divisors (42737656583).

128212969737 is an equidigital number, since it uses as much as digits as its factorization.

128212969737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42737656582.

The product of its digits is 4572288, while the sum is 57.

The spelling of 128212969737 in words is "one hundred twenty-eight billion, two hundred twelve million, nine hundred sixty-nine thousand, seven hundred thirty-seven".