681532889194 has 8 divisors (see below), whose sum is σ = 1022685552288. Its totient is φ = 340637705100.

The previous prime is 681532889183. The next prime is 681532889221. The reversal of 681532889194 is 491988235186.

It is a happy number.

681532889194 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64363132 + ... + 64373719.

It is an arithmetic number, because the mean of its divisors is an integer number (127835694036).

Almost surely, 2^681532889194 is an apocalyptic number.

681532889194 is a deficient number, since it is larger than the sum of its proper divisors (341152663094).

681532889194 is a wasteful number, since it uses less digits than its factorization.

681532889194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128739500.

The product of its digits is 29859840, while the sum is 64.

The spelling of 681532889194 in words is "six hundred eighty-one billion, five hundred thirty-two million, eight hundred eighty-nine thousand, one hundred ninety-four".