61398533064 has 64 divisors (see below), whose sum is σ = 170610027840. Its totient is φ = 18254562560.

The previous prime is 61398533047. The next prime is 61398533087. The reversal of 61398533064 is 46033589316.

It is a super-2 number, since 2×61398533064² (a number of 22 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 2180067 + ... + 2208050.

It is an arithmetic number, because the mean of its divisors is an integer number (2665781685).

Almost surely, 2^61398533064 is an apocalyptic number.

It is an amenable number.

61398533064 is an abundant number, since it is smaller than the sum of its proper divisors (109211494776).

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

61398533064 is a wasteful number, since it uses less digits than its factorization.

61398533064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388190 (or 4388186 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 48.

The spelling of 61398533064 in words is "sixty-one billion, three hundred ninety-eight million, five hundred thirty-three thousand, sixty-four".