1491233003640 has 384 divisors, whose sum is σ = 5320517529600. Its totient is φ = 360816353280.

The previous prime is 1491233003597. The next prime is 1491233003669. The reversal of 1491233003640 is 463003321941.

1491233003640 is a `hidden beast` number, since 1 + 4 + 9 + 1 + 2 + 3 + 3 + 0 + 0 + 3 + 640 = 666.

It is a super-2 number, since 2×1491233003640² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1491233003595 and 1491233003604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20531629 + ... + 20604131.

It is an arithmetic number, because the mean of its divisors is an integer number (13855514400).

Almost surely, 2^{1491233003640} is an apocalyptic number.

1491233003640 is a gapful number since it is divisible by the number (10) 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 1491233003640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2660258764800).

1491233003640 is an abundant number, since it is smaller than the sum of its proper divisors (3829284525960).

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

1491233003640 is a wasteful number, since it uses less digits than its factorization.

1491233003640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72667 (or 72660 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The spelling of 1491233003640 in words is "one trillion, four hundred ninety-one billion, two hundred thirty-three million, three thousand, six hundred forty".