4001261240856 has 64 divisors (see below), whose sum is σ = 11009101806720. Its totient is φ = 1201773278720.

The previous prime is 4001261240677. The next prime is 4001261240857. The reversal of 4001261240856 is 6580421621004.

It is a happy number.

It is a super-2 number, since 2×4001261240856² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4001261240857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67033410 + ... + 67093073.

It is an arithmetic number, because the mean of its divisors is an integer number (172017215730).

Almost surely, 2^{4001261240856} is an apocalyptic number.

It is an amenable number.

4001261240856 is an abundant number, since it is smaller than the sum of its proper divisors (7007840565864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4001261240856 is a wasteful number, since it uses less digits than its factorization.

4001261240856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134126616 (or 134126612 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The spelling of 4001261240856 in words is "four trillion, one billion, two hundred sixty-one million, two hundred forty thousand, eight hundred fifty-six".