4001261238855 has 24 divisors (see below), whose sum is σ = 6986143721232. Its totient is φ = 2118429304704.

The previous prime is 4001261238847. The next prime is 4001261238857. The reversal of 4001261238855 is 5588321621004.

4001261238855 is a `hidden beast` number, since 4 + 0 + 0 + 1 + 261 + 2 + 388 + 5 + 5 = 666.

It is not a de Polignac number, because 4001261238855 - 2³ = 4001261238847 is a prime.

It is a super-2 number, since 2×4001261238855² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 4001261238855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4001261238857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 324508129 + ... + 324520458.

It is an arithmetic number, because the mean of its divisors is an integer number (291089321718).

Almost surely, 2^{4001261238855} is an apocalyptic number.

4001261238855 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

4001261238855 is a deficient number, since it is larger than the sum of its proper divisors (2984882482377).

4001261238855 is a wasteful number, since it uses less digits than its factorization.

4001261238855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649028735 (or 649028732 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

Adding to 4001261238855 its reverse (5588321621004), we get a palindrome (9589582859859).

The spelling of 4001261238855 in words is "four trillion, one billion, two hundred sixty-one million, two hundred thirty-eight thousand, eight hundred fifty-five".