1640649674560 has 168 divisors, whose sum is σ = 4254095855520. Its totient is φ = 602390550528.

The previous prime is 1640649674533. The next prime is 1640649674633. The reversal of 1640649674560 is 654769460461.

It is a super-2 number, since 2×1640649674560² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1640649674495 and 1640649674504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9595579 + ... + 9765061.

It is an arithmetic number, because the mean of its divisors is an integer number (25321999140).

Almost surely, 2^{1640649674560} is an apocalyptic number.

1640649674560 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 1640649674560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2127047927760).

1640649674560 is an abundant number, since it is smaller than the sum of its proper divisors (2613446180960).

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

1640649674560 is a wasteful number, since it uses less digits than its factorization.

1640649674560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169705 (or 169682 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 58.

The spelling of 1640649674560 in words is "one trillion, six hundred forty billion, six hundred forty-nine million, six hundred seventy-four thousand, five hundred sixty".