91753808645 has 8 divisors (see below), whose sum is σ = 110107033080. Its totient is φ = 73401405120.

The previous prime is 91753808633. The next prime is 91753808647. The reversal of 91753808645 is 54680835719.

It can be written as a sum of positive squares in 4 ways, for example, as 11416708801 + 80337099844 = 106849^2 + 283438^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91753808645 - 2⁶ = 91753808581 is a prime.

It is a super-2 number, since 2×91753808645² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91753808647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75611 + ... + 434999.

It is an arithmetic number, because the mean of its divisors is an integer number (13763379135).

Almost surely, 2^91753808645 is an apocalyptic number.

It is an amenable number.

91753808645 is a deficient number, since it is larger than the sum of its proper divisors (18353224435).

91753808645 is a wasteful number, since it uses less digits than its factorization.

91753808645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410455.

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 91753808645 in words is "ninety-one billion, seven hundred fifty-three million, eight hundred eight thousand, six hundred forty-five".