128146158267491 has 32 divisors (see below), whose sum is σ = 160149069480960. Its totient is φ = 99829211239296.

The previous prime is 128146158267487. The next prime is 128146158267527. The reversal of 128146158267491 is 194762851641821.

It is not a de Polignac number, because 128146158267491 - 2² = 128146158267487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128146158267091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7689005 + ... + 17759873.

It is an arithmetic number, because the mean of its divisors is an integer number (5004658421280).

Almost surely, 2^{128146158267491} is an apocalyptic number.

128146158267491 is a deficient number, since it is larger than the sum of its proper divisors (32002911213469).

128146158267491 is a wasteful number, since it uses less digits than its factorization.

128146158267491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10073043.

The product of its digits is 46448640, while the sum is 65.

Adding to 128146158267491 its sum of digits (65), we get a square (128146158267556 = 11320166²).

The spelling of 128146158267491 in words is "one hundred twenty-eight trillion, one hundred forty-six billion, one hundred fifty-eight million, two hundred sixty-seven thousand, four hundred ninety-one".