83978672577 has 4 divisors (see below), whose sum is σ = 111971563440. Its totient is φ = 55985781716.

The previous prime is 83978672551. The next prime is 83978672579. The reversal of 83978672577 is 77527687938.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83978672577 - 2⁸ = 83978672321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83978672579) 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 in 3 ways as a sum of consecutive naturals, for example, 13996445427 + ... + 13996445432.

It is an arithmetic number, because the mean of its divisors is an integer number (27992890860).

Almost surely, 2^83978672577 is an apocalyptic number.

It is an amenable number.

83978672577 is a deficient number, since it is larger than the sum of its proper divisors (27992890863).

83978672577 is a wasteful number, since it uses less digits than its factorization.

83978672577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27992890862.

The product of its digits is 248935680, while the sum is 69.

The spelling of 83978672577 in words is "eighty-three billion, nine hundred seventy-eight million, six hundred seventy-two thousand, five hundred seventy-seven".