643742805948 has 48 divisors (see below), whose sum is σ = 1654842026880. Its totient is φ = 193142152000.

The previous prime is 643742805931. The next prime is 643742805961. The reversal of 643742805948 is 849508247346.

It is a junction number, because it is equal to n+sod(n) for n = 643742805891 and 643742805900.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24129438 + ... + 24156101.

It is an arithmetic number, because the mean of its divisors is an integer number (34475875560).

Almost surely, 2^643742805948 is an apocalyptic number.

It is an amenable number.

643742805948 is an abundant number, since it is smaller than the sum of its proper divisors (1011099220932).

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

643742805948 is a wasteful number, since it uses less digits than its factorization.

643742805948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48285658 (or 48285656 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 60.

The spelling of 643742805948 in words is "six hundred forty-three billion, seven hundred forty-two million, eight hundred five thousand, nine hundred forty-eight".