67109591644 has 24 divisors (see below), whose sum is σ = 119990384640. Its totient is φ = 32827218096.

The previous prime is 67109591623. The next prime is 67109591657. The reversal of 67109591644 is 44619590176.

It is a junction number, because it is equal to n+sod(n) for n = 67109591591 and 67109591600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387097 + ... + 532975.

It is an arithmetic number, because the mean of its divisors is an integer number (4999599360).

Almost surely, 2^67109591644 is an apocalyptic number.

It is an amenable number.

67109591644 is a deficient number, since it is larger than the sum of its proper divisors (52880792996).

67109591644 is a wasteful number, since it uses less digits than its factorization.

67109591644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148377 (or 148375 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 67109591644 in words is "sixty-seven billion, one hundred nine million, five hundred ninety-one thousand, six hundred forty-four".