91784692945 has 16 divisors (see below), whose sum is σ = 127222420608. Its totient is φ = 62825885440.

The previous prime is 91784692943. The next prime is 91784692969. The reversal of 91784692945 is 54929648719.

It is not a de Polignac number, because 91784692945 - 2¹ = 91784692943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91784692943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49081789 + ... + 49083658.

It is an arithmetic number, because the mean of its divisors is an integer number (7951401288).

Almost surely, 2^91784692945 is an apocalyptic number.

It is an amenable number.

91784692945 is a deficient number, since it is larger than the sum of its proper divisors (35437727663).

91784692945 is a wasteful number, since it uses less digits than its factorization.

91784692945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98165480.

The product of its digits is 39191040, while the sum is 64.

The spelling of 91784692945 in words is "ninety-one billion, seven hundred eighty-four million, six hundred ninety-two thousand, nine hundred forty-five".