1649818992640 has 792 divisors, whose sum is σ = 5250092951160. Its totient is φ = 494659436544.

The previous prime is 1649818992589. The next prime is 1649818992677. The reversal of 1649818992640 is 462998189461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 86832578551 + ... + 86832578569.

Almost surely, 2^{1649818992640} is an apocalyptic number.

1649818992640 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 1649818992640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2625046475580).

1649818992640 is an abundant number, since it is smaller than the sum of its proper divisors (3600273958520).

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

1649818992640 is an frugal number, since it uses more digits than its factorization.

1649818992640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 67.

The spelling of 1649818992640 in words is "one trillion, six hundred forty-nine billion, eight hundred eighteen million, nine hundred ninety-two thousand, six hundred forty".