1640388875000 has 56 divisors (see below), whose sum is σ = 3844612507080. Its totient is φ = 656155500000.

The previous prime is 1640388874997. The next prime is 1640388875071. The reversal of 1640388875000 is 5788830461.

It is a super-2 number, since 2×1640388875000² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a self number, because there is not a number n which added to its sum of digits gives 1640388875000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 6436556 + ... + 6686555.

Almost surely, 2^{1640388875000} is an apocalyptic number.

1640388875000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640388875000 is an abundant number, since it is smaller than the sum of its proper divisors (2204223632080).

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

1640388875000 is an frugal number, since it uses more digits than its factorization.

1640388875000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13123147 (or 13123118 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 1640388875000 in words is "one trillion, six hundred forty billion, three hundred eighty-eight million, eight hundred seventy-five thousand".