1640485325720 has 32 divisors (see below), whose sum is σ = 3692806571520. Its totient is φ = 655889314560.

The previous prime is 1640485325681. The next prime is 1640485325837. The reversal of 1640485325720 is 275235840461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9438296 + ... + 9610535.

It is an arithmetic number, because the mean of its divisors is an integer number (115400205360).

Almost surely, 2^{1640485325720} is an apocalyptic number.

1640485325720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640485325720 is an abundant number, since it is smaller than the sum of its proper divisors (2052321245800).

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

1640485325720 is a wasteful number, since it uses less digits than its factorization.

1640485325720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19050995 (or 19050991 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 47.

The spelling of 1640485325720 in words is "one trillion, six hundred forty billion, four hundred eighty-five million, three hundred twenty-five thousand, seven hundred twenty".