649903435203240 has 640 divisors, whose sum is σ = 2319526927872000. Its totient is φ = 162941480755200.

The previous prime is 649903435203233. The next prime is 649903435203287. The reversal of 649903435203240 is 42302534309946.

649903435203240 is a `hidden beast` number, since 6 + 4 + 9 + 9 + 0 + 3 + 43 + 520 + 32 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 983881396 + ... + 984541724.

It is an arithmetic number, because the mean of its divisors is an integer number (3624260824800).

Almost surely, 2^{649903435203240} is an apocalyptic number.

649903435203240 is a gapful number since it is divisible by the number (60) 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 649903435203240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1159763463936000).

649903435203240 is an abundant number, since it is smaller than the sum of its proper divisors (1669623492668760).

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

649903435203240 is a wasteful number, since it uses less digits than its factorization.

649903435203240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660663 (or 660650 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 54.

The spelling of 649903435203240 in words is "six hundred forty-nine trillion, nine hundred three billion, four hundred thirty-five million, two hundred three thousand, two hundred forty".