681532203924648 has 24 divisors (see below), whose sum is σ = 1845816385629450. Its totient is φ = 227177401308192.

The previous prime is 681532203924599. The next prime is 681532203924653. The reversal of 681532203924648 is 846429302235186.

681532203924648 is a `hidden beast` number, since 6 + 8 + 1 + 532 + 2 + 0 + 3 + 92 + 4 + 6 + 4 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 663008838085764 + 18523365838884 = 25748958^2 + 4303878^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×681532203924648² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4732862527183 + ... + 4732862527326.

Almost surely, 2^{681532203924648} is an apocalyptic number.

It is an amenable number.

681532203924648 is an abundant number, since it is smaller than the sum of its proper divisors (1164284181704802).

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

681532203924648 is a wasteful number, since it uses less digits than its factorization.

681532203924648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9465725054521 (or 9465725054514 counting only the distinct ones).

The product of its (nonzero) digits is 119439360, while the sum is 63.

The spelling of 681532203924648 in words is "six hundred eighty-one trillion, five hundred thirty-two billion, two hundred three million, nine hundred twenty-four thousand, six hundred forty-eight".