45171678581 has 18 divisors (see below), whose sum is σ = 47581476930. Its totient is φ = 42832745760.

The previous prime is 45171678569. The next prime is 45171678599. The reversal of 45171678581 is 18587617154.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1768623025 + 43403055556 = 42055^2 + 208334^2 .

It is not a de Polignac number, because 45171678581 - 2³⁴ = 27991809397 is a prime.

It is a super-2 number, since 2×45171678581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45171678511) 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 17 ways as a sum of consecutive naturals, for example, 69816800 + ... + 69817446.

It is an arithmetic number, because the mean of its divisors is an integer number (2643415385).

Almost surely, 2^45171678581 is an apocalyptic number.

It is an amenable number.

45171678581 is a deficient number, since it is larger than the sum of its proper divisors (2409798349).

45171678581 is an frugal number, since it uses more digits than its factorization.

45171678581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445 (or 737 counting only the distinct ones).

The product of its digits is 1881600, while the sum is 53.

The spelling of 45171678581 in words is "forty-five billion, one hundred seventy-one million, six hundred seventy-eight thousand, five hundred eighty-one".