61806045776 has 20 divisors (see below), whose sum is σ = 119762409492. Its totient is φ = 30899617536.

The previous prime is 61806045751. The next prime is 61806045799. The reversal of 61806045776 is 67754060816.

It can be written as a sum of positive squares in 2 ways, for example, as 39283240000 + 22522805776 = 198200^2 + 150076^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 59765 + ... + 356628.

Almost surely, 2^61806045776 is an apocalyptic number.

It is an amenable number.

61806045776 is a deficient number, since it is larger than the sum of its proper divisors (57956363716).

61806045776 is a wasteful number, since it uses less digits than its factorization.

61806045776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425678 (or 425672 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 61806045776 in words is "sixty-one billion, eight hundred six million, forty-five thousand, seven hundred seventy-six".