67947454649 has 4 divisors (see below), whose sum is σ = 71944363764. Its totient is φ = 63950545536.

The previous prime is 67947454643. The next prime is 67947454699. The reversal of 67947454649 is 94645474976.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22368193600 + 45579261049 = 149560^2 + 213493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67947454649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67947454643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1998454532 + ... + 1998454565.

It is an arithmetic number, because the mean of its divisors is an integer number (17986090941).

Almost surely, 2^67947454649 is an apocalyptic number.

It is an amenable number.

67947454649 is a deficient number, since it is larger than the sum of its proper divisors (3996909115).

67947454649 is a wasteful number, since it uses less digits than its factorization.

67947454649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996909114.

The product of its digits is 182891520, while the sum is 65.

The spelling of 67947454649 in words is "sixty-seven billion, nine hundred forty-seven million, four hundred fifty-four thousand, six hundred forty-nine".