681925606816 has 12 divisors (see below), whose sum is σ = 1342541038482. Its totient is φ = 340962803392.

The previous prime is 681925606807. The next prime is 681925606819. The reversal of 681925606816 is 618606529186.

It can be written as a sum of positive squares in only one way, i.e., 395062531600 + 286863075216 = 628540^2 + 535596^2 .

It is not an unprimeable number, because it can be changed into a prime (681925606819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655087575 + ... + 10655087638.

Almost surely, 2^681925606816 is an apocalyptic number.

It is an amenable number.

681925606816 is a deficient number, since it is larger than the sum of its proper divisors (660615431666).

681925606816 is a wasteful number, since it uses less digits than its factorization.

681925606816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21310175223 (or 21310175215 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 58.

The spelling of 681925606816 in words is "six hundred eighty-one billion, nine hundred twenty-five million, six hundred six thousand, eight hundred sixteen".