61243545064 has 16 divisors (see below), whose sum is σ = 123664850820. Its totient is φ = 28266251520.

The previous prime is 61243545053. The next prime is 61243545073. The reversal of 61243545064 is 46054534216.

It can be written as a sum of positive squares in 2 ways, for example, as 50060482564 + 11183062500 = 223742^2 + 105750^2 .

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 3 ways as a sum of consecutive naturals, for example, 294440017 + ... + 294440224.

Almost surely, 2^61243545064 is an apocalyptic number.

It is an amenable number.

61243545064 is an abundant number, since it is smaller than the sum of its proper divisors (62421305756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61243545064 is a wasteful number, since it uses less digits than its factorization.

61243545064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588880260 (or 588880256 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 61243545064 in words is "sixty-one billion, two hundred forty-three million, five hundred forty-five thousand, sixty-four".