83503688978 has 4 divisors (see below), whose sum is σ = 125255533470. Its totient is φ = 41751844488.

The previous prime is 83503688971. The next prime is 83503689001. The reversal of 83503688978 is 87988630538.

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., 80682698209 + 2820990769 = 284047^2 + 53113^2 .

It is not an unprimeable number, because it can be changed into a prime (83503688971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20875922243 + ... + 20875922246.

Almost surely, 2^83503688978 is an apocalyptic number.

83503688978 is a deficient number, since it is larger than the sum of its proper divisors (41751844492).

83503688978 is a wasteful number, since it uses less digits than its factorization.

83503688978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41751844491.

The product of its (nonzero) digits is 69672960, while the sum is 65.

The spelling of 83503688978 in words is "eighty-three billion, five hundred three million, six hundred eighty-eight thousand, nine hundred seventy-eight".