203126407640 has 128 divisors (see below), whose sum is σ = 521278329600. Its totient is φ = 70616655360.

The previous prime is 203126407619. The next prime is 203126407663. The reversal of 203126407640 is 46704621302.

It is a self number, because there is not a number n which added to its sum of digits gives 203126407640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1547375 + ... + 1673505.

It is an arithmetic number, because the mean of its divisors is an integer number (4072486950).

Almost surely, 2^203126407640 is an apocalyptic number.

203126407640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 203126407640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260639164800).

203126407640 is an abundant number, since it is smaller than the sum of its proper divisors (318151921960).

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

203126407640 is a wasteful number, since it uses less digits than its factorization.

203126407640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126337 (or 126333 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 35.

The spelling of 203126407640 in words is "two hundred three billion, one hundred twenty-six million, four hundred seven thousand, six hundred forty".