45161477721 has 48 divisors (see below), whose sum is σ = 72074954880. Its totient is φ = 27937163520.

The previous prime is 45161477719. The next prime is 45161477731. The reversal of 45161477721 is 12777416154.

45161477721 is a `hidden beast` number, since 4 + 5 + 1 + 614 + 7 + 7 + 7 + 21 = 666.

It is not a de Polignac number, because 45161477721 - 2¹ = 45161477719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45161477731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 513255 + ... + 594771.

It is an arithmetic number, because the mean of its divisors is an integer number (1501561560).

Almost surely, 2^45161477721 is an apocalyptic number.

It is an amenable number.

45161477721 is a deficient number, since it is larger than the sum of its proper divisors (26913477159).

45161477721 is a wasteful number, since it uses less digits than its factorization.

45161477721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81631 (or 81608 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The spelling of 45161477721 in words is "forty-five billion, one hundred sixty-one million, four hundred seventy-seven thousand, seven hundred twenty-one".