128212465767 has 64 divisors (see below), whose sum is σ = 186235822080. Its totient is φ = 78162022400.

The previous prime is 128212465757. The next prime is 128212465769. The reversal of 128212465767 is 767564212821.

It is a cyclic number.

It is not a de Polignac number, because 128212465767 - 2¹⁶ = 128212400231 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128212465769) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 148565578 + ... + 148566440.

It is an arithmetic number, because the mean of its divisors is an integer number (2909934720).

Almost surely, 2^128212465767 is an apocalyptic number.

128212465767 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

128212465767 is a deficient number, since it is larger than the sum of its proper divisors (58023356313).

128212465767 is a wasteful number, since it uses less digits than its factorization.

128212465767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504.

The product of its digits is 2257920, while the sum is 51.

The spelling of 128212465767 in words is "one hundred twenty-eight billion, two hundred twelve million, four hundred sixty-five thousand, seven hundred sixty-seven".