91679803787 has 16 divisors (see below), whose sum is σ = 108352726272. Its totient is φ = 76473397920.

The previous prime is 91679803771. The next prime is 91679803801. The reversal of 91679803787 is 78730897619.

It is a cyclic number.

It is not a de Polignac number, because 91679803787 - 2⁴ = 91679803771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91679803717) 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 15 ways as a sum of consecutive naturals, for example, 1895633 + ... + 1943394.

It is an arithmetic number, because the mean of its divisors is an integer number (6772045392).

Almost surely, 2^91679803787 is an apocalyptic number.

91679803787 is a deficient number, since it is larger than the sum of its proper divisors (16672922485).

91679803787 is a wasteful number, since it uses less digits than its factorization.

91679803787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3839218.

The product of its (nonzero) digits is 32006016, while the sum is 65.

The spelling of 91679803787 in words is "ninety-one billion, six hundred seventy-nine million, eight hundred three thousand, seven hundred eighty-seven".