128012022774442 has 4 divisors (see below), whose sum is σ = 192018034161666. Its totient is φ = 64006011387220.

The previous prime is 128012022774437. The next prime is 128012022774443. The reversal of 128012022774442 is 244477220210821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 120234053986641 + 7777968787801 = 10965129^2 + 2788901^2 .

It is a super-2 number, since 2×128012022774442² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128012022774392 and 128012022774401.

It is not an unprimeable number, because it can be changed into a prime (128012022774443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32003005693609 + ... + 32003005693612.

Almost surely, 2^{128012022774442} is an apocalyptic number.

128012022774442 is a deficient number, since it is larger than the sum of its proper divisors (64006011387224).

128012022774442 is an equidigital number, since it uses as much as digits as its factorization.

128012022774442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64006011387223.

The product of its (nonzero) digits is 802816, while the sum is 46.

The spelling of 128012022774442 in words is "one hundred twenty-eight trillion, twelve billion, twenty-two million, seven hundred seventy-four thousand, four hundred forty-two".