128151495781 has 2 divisors, whose sum is σ = 128151495782. Its totient is φ = 128151495780.

The previous prime is 128151495757. The next prime is 128151495793. The reversal of 128151495781 is 187594151821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99120447556 + 29031048225 = 314834^2 + 170385^2 .

It is a cyclic number.

It is not a de Polignac number, because 128151495781 - 2¹¹ = 128151493733 is a prime.

It is a super-2 number, since 2×128151495781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128151495721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64075747890 + 64075747891.

It is an arithmetic number, because the mean of its divisors is an integer number (64075747891).

Almost surely, 2^128151495781 is an apocalyptic number.

It is an amenable number.

128151495781 is a deficient number, since it is larger than the sum of its proper divisors (1).

128151495781 is an equidigital number, since it uses as much as digits as its factorization.

128151495781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 52.

The spelling of 128151495781 in words is "one hundred twenty-eight billion, one hundred fifty-one million, four hundred ninety-five thousand, seven hundred eighty-one".