61889806438 has 16 divisors (see below), whose sum is σ = 93350568960. Its totient is φ = 30773100736.

The previous prime is 61889806417. The next prime is 61889806457. The reversal of 61889806438 is 83460898816.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 811803 + ... + 884761.

It is an arithmetic number, because the mean of its divisors is an integer number (5834410560).

Almost surely, 2^61889806438 is an apocalyptic number.

61889806438 is a deficient number, since it is larger than the sum of its proper divisors (31460762522).

61889806438 is a wasteful number, since it uses less digits than its factorization.

61889806438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75311.

The product of its (nonzero) digits is 15925248, while the sum is 61.

The spelling of 61889806438 in words is "sixty-one billion, eight hundred eighty-nine million, eight hundred six thousand, four hundred thirty-eight".