78501478645042 has 4 divisors (see below), whose sum is σ = 117752217967566. Its totient is φ = 39250739322520.

The previous prime is 78501478645039. The next prime is 78501478645097. The reversal of 78501478645042 is 24054687410587.

It is a happy number.

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., 78496605348561 + 4873296481 = 8859831^2 + 69809^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19625369661259 + ... + 19625369661262.

Almost surely, 2^{78501478645042} is an apocalyptic number.

78501478645042 is a deficient number, since it is larger than the sum of its proper divisors (39250739322524).

78501478645042 is a wasteful number, since it uses less digits than its factorization.

78501478645042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39250739322523.

The product of its (nonzero) digits is 60211200, while the sum is 61.

The spelling of 78501478645042 in words is "seventy-eight trillion, five hundred one billion, four hundred seventy-eight million, six hundred forty-five thousand, forty-two".