67016540978 has 4 divisors (see below), whose sum is σ = 100524811470. Its totient is φ = 33508270488.

The previous prime is 67016540977. The next prime is 67016540989. The reversal of 67016540978 is 87904561076.

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., 37078198249 + 29938342729 = 192557^2 + 173027^2 .

It is not an unprimeable number, because it can be changed into a prime (67016540971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16754135243 + ... + 16754135246.

Almost surely, 2^67016540978 is an apocalyptic number.

67016540978 is a deficient number, since it is larger than the sum of its proper divisors (33508270492).

67016540978 is a wasteful number, since it uses less digits than its factorization.

67016540978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33508270491.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 67016540978 in words is "sixty-seven billion, sixteen million, five hundred forty thousand, nine hundred seventy-eight".