646533530640 has 200 divisors, whose sum is σ = 2363691749760. Its totient is φ = 163334755584.

The previous prime is 646533530639. The next prime is 646533530641. The reversal of 646533530640 is 46035335646.

646533530640 is a `hidden beast` number, since 6 + 4 + 6 + 5 + 335 + 306 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (646533530639) and next prime (646533530641).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (646533530641) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2502504 + ... + 2748743.

Almost surely, 2^646533530640 is an apocalyptic number.

646533530640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646533530640 is an abundant number, since it is smaller than the sum of its proper divisors (1717158219120).

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

646533530640 is a wasteful number, since it uses less digits than its factorization.

646533530640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5251291 (or 5251276 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 45.

The spelling of 646533530640 in words is "six hundred forty-six billion, five hundred thirty-three million, five hundred thirty thousand, six hundred forty".