67158780649 has 16 divisors (see below), whose sum is σ = 71091717120. Its totient is φ = 63356832000.

The previous prime is 67158780643. The next prime is 67158780677. The reversal of 67158780649 is 94608785176.

It is a cyclic number.

It is not a de Polignac number, because 67158780649 - 2⁹ = 67158780137 is a prime.

It is a super-2 number, since 2×67158780649² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67158780643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24469 + ... + 367309.

It is an arithmetic number, because the mean of its divisors is an integer number (4443232320).

Almost surely, 2^67158780649 is an apocalyptic number.

It is an amenable number.

67158780649 is a deficient number, since it is larger than the sum of its proper divisors (3932936471).

67158780649 is a wasteful number, since it uses less digits than its factorization.

67158780649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343032.

The product of its (nonzero) digits is 20321280, while the sum is 61.

The spelling of 67158780649 in words is "sixty-seven billion, one hundred fifty-eight million, seven hundred eighty thousand, six hundred forty-nine".