61820855044 has 81 divisors (see below), whose sum is σ = 119689055199. Its totient is φ = 27927020160.

The previous prime is 61820855021. The next prime is 61820855071. The reversal of 61820855044 is 44055802816.

The square root of 61820855044 is 248638.

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

It can be written as a sum of positive squares in 4 ways, for example, as 6219215044 + 55601640000 = 78862^2 + 235800^2 .

It is a Duffinian number.

It is an unprimeable number.

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 26 ways as a sum of consecutive naturals, for example, 471914859 + ... + 471914989.

Almost surely, 2^61820855044 is an apocalyptic number.

61820855044 is the 248638-th square number.

It is an amenable number.

61820855044 is a deficient number, since it is larger than the sum of its proper divisors (57868200155).

61820855044 is a wasteful number, since it uses less digits than its factorization.

61820855044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 43.

The spelling of 61820855044 in words is "sixty-one billion, eight hundred twenty million, eight hundred fifty-five thousand, forty-four".