91784429645 has 16 divisors (see below), whose sum is σ = 115945798080. Its totient is φ = 69558393600.

The previous prime is 91784429609. The next prime is 91784429651. The reversal of 91784429645 is 54692448719.

It is a de Polignac number, because none of the positive numbers 2^k-91784429645 is a prime.

It is a super-3 number, since 3×91784429645³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2466830 + ... + 2503760.

It is an arithmetic number, because the mean of its divisors is an integer number (7246612380).

Almost surely, 2^91784429645 is an apocalyptic number.

91784429645 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

91784429645 is a deficient number, since it is larger than the sum of its proper divisors (24161368435).

91784429645 is a wasteful number, since it uses less digits than its factorization.

91784429645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63116.

The product of its digits is 17418240, while the sum is 59.

The spelling of 91784429645 in words is "ninety-one billion, seven hundred eighty-four million, four hundred twenty-nine thousand, six hundred forty-five".