128261865840615 has 48 divisors (see below), whose sum is σ = 239440402813248. Its totient is φ = 63139489141248.

The previous prime is 128261865840583. The next prime is 128261865840739. The reversal of 128261865840615 is 516048568162821.

128261865840615 is a `hidden beast` number, since 1 + 2 + 8 + 2 + 6 + 1 + 8 + 6 + 5 + 8 + 4 + 0 + 615 = 666.

It is not a de Polignac number, because 128261865840615 - 2⁵ = 128261865840583 is a prime.

It is a super-2 number, since 2×128261865840615² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 671854 + ... + 16030443.

It is an arithmetic number, because the mean of its divisors is an integer number (4988341725276).

Almost surely, 2^{128261865840615} is an apocalyptic number.

128261865840615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128261865840615 is a deficient number, since it is larger than the sum of its proper divisors (111178536972633).

128261865840615 is a wasteful number, since it uses less digits than its factorization.

128261865840615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16715448 (or 16715445 counting only the distinct ones).

The product of its (nonzero) digits is 44236800, while the sum is 63.

The spelling of 128261865840615 in words is "one hundred twenty-eight trillion, two hundred sixty-one billion, eight hundred sixty-five million, eight hundred forty thousand, six hundred fifteen".