401661051100 has 72 divisors (see below), whose sum is σ = 903042646016. Its totient is φ = 154907640000.

The previous prime is 401661051091. The next prime is 401661051107. The reversal of 401661051100 is 1150166104.

It is a super-2 number, since 2×401661051100² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401661051107) 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 23 ways as a sum of consecutive naturals, for example, 601045 + ... + 1079155.

Almost surely, 2^401661051100 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 401661051100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (451521323008).

401661051100 is an abundant number, since it is smaller than the sum of its proper divisors (501381594916).

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

401661051100 is a wasteful number, since it uses less digits than its factorization.

401661051100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478427 (or 478420 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 401661051100 in words is "four hundred one billion, six hundred sixty-one million, fifty-one thousand, one hundred".