4001401266500 has 96 divisors (see below), whose sum is σ = 9535765599360. Its totient is φ = 1454712336000.

The previous prime is 4001401266431. The next prime is 4001401266503. The reversal of 4001401266500 is 56621041004.

It is a super-2 number, since 2×4001401266500² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4001401266503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23880011 + ... + 24046989.

It is an arithmetic number, because the mean of its divisors is an integer number (99330891660).

Almost surely, 2^{4001401266500} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4001401266500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4767882799680).

4001401266500 is an abundant number, since it is smaller than the sum of its proper divisors (5534364332860).

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

4001401266500 is a wasteful number, since it uses less digits than its factorization.

4001401266500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171366 (or 171354 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 4001401266500 in words is "four trillion, one billion, four hundred one million, two hundred sixty-six thousand, five hundred".