681616428602 has 4 divisors (see below), whose sum is σ = 1022424642906. Its totient is φ = 340808214300.

The previous prime is 681616428601. The next prime is 681616428607. The reversal of 681616428602 is 206824616186.

681616428602 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 618926784961 + 62689643641 = 786719^2 + 250379^2 .

It is not an unprimeable number, because it can be changed into a prime (681616428601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170404107149 + ... + 170404107152.

Almost surely, 2^681616428602 is an apocalyptic number.

681616428602 is a deficient number, since it is larger than the sum of its proper divisors (340808214304).

681616428602 is a wasteful number, since it uses less digits than its factorization.

681616428602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340808214303.

The product of its (nonzero) digits is 1327104, while the sum is 50.

The spelling of 681616428602 in words is "six hundred eighty-one billion, six hundred sixteen million, four hundred twenty-eight thousand, six hundred two".