45863621721 has 12 divisors (see below), whose sum is σ = 66444037972. Its totient is φ = 30485016576.

The previous prime is 45863621719. The next prime is 45863621729. The reversal of 45863621721 is 12712636854.

45863621721 is a `hidden beast` number, since 4 + 5 + 8 + 636 + 2 + 1 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19283210496 + 26580411225 = 138864^2 + 163035^2 .

It is not a de Polignac number, because 45863621721 - 2¹ = 45863621719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45863621729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7557736 + ... + 7563801.

Almost surely, 2^45863621721 is an apocalyptic number.

It is an amenable number.

45863621721 is a deficient number, since it is larger than the sum of its proper divisors (20580416251).

45863621721 is a wasteful number, since it uses less digits than its factorization.

45863621721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15121880 (or 15121877 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 45863621721 in words is "forty-five billion, eight hundred sixty-three million, six hundred twenty-one thousand, seven hundred twenty-one".