45182178721 has 3 divisors (see below), whose sum is σ = 45182391283. Its totient is φ = 45181966160.

The previous prime is 45182178641. The next prime is 45182178737. The reversal of 45182178721 is 12787128154.

The square root of 45182178721 is 212561.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 44368788321 + 813390400 = 210639^2 + 28520^2 .

It is not a de Polignac number, because 45182178721 - 2³¹ = 43034695073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45182178761) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 106281 + ... + 318841.

Almost surely, 2^45182178721 is an apocalyptic number.

45182178721 is the 212561-st square number.

45182178721 is the 106281-st centered octagonal number.

It is an amenable number.

45182178721 is a deficient number, since it is larger than the sum of its proper divisors (212562).

45182178721 is an frugal number, since it uses more digits than its factorization.

45182178721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425122 (or 212561 counting only the distinct ones).

The product of its digits is 250880, while the sum is 46.

The spelling of 45182178721 in words is "forty-five billion, one hundred eighty-two million, one hundred seventy-eight thousand, seven hundred twenty-one".