45444631681 has 8 divisors (see below), whose sum is σ = 45730992384. Its totient is φ = 45158440800.

The previous prime is 45444631669. The next prime is 45444631697. The reversal of 45444631681 is 18613644454.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 45444631681 - 2¹³ = 45444623489 is a prime.

It is a super-2 number, since 2×45444631681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45444631601) 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, 517581 + ... + 598981.

It is an arithmetic number, because the mean of its divisors is an integer number (5716374048).

Almost surely, 2^45444631681 is an apocalyptic number.

It is an amenable number.

45444631681 is a deficient number, since it is larger than the sum of its proper divisors (286360703).

45444631681 is a wasteful number, since it uses less digits than its factorization.

45444631681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84911.

The product of its digits is 1105920, while the sum is 46.

The spelling of 45444631681 in words is "forty-five billion, four hundred forty-four million, six hundred thirty-one thousand, six hundred eighty-one".