67540751978 has 16 divisors (see below), whose sum is σ = 115789976064. Its totient is φ = 28944579120.

The previous prime is 67540751977. The next prime is 67540751981. The reversal of 67540751978 is 87915704576.

It is not an unprimeable number, because it can be changed into a prime (67540751977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194951 + ... + 416037.

It is an arithmetic number, because the mean of its divisors is an integer number (7236873504).

Almost surely, 2^67540751978 is an apocalyptic number.

67540751978 is a deficient number, since it is larger than the sum of its proper divisors (48249224086).

67540751978 is a wasteful number, since it uses less digits than its factorization.

67540751978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242917.

The product of its (nonzero) digits is 14817600, while the sum is 59.

The spelling of 67540751978 in words is "sixty-seven billion, five hundred forty million, seven hundred fifty-one thousand, nine hundred seventy-eight".