61891544054 has 16 divisors (see below), whose sum is σ = 102572176608. Its totient is φ = 27859108992.

The previous prime is 61891543997. The next prime is 61891544069. The reversal of 61891544054 is 45044519816.

It is a Curzon number.

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, 39571817 + ... + 39573380.

It is an arithmetic number, because the mean of its divisors is an integer number (6410761038).

Almost surely, 2^61891544054 is an apocalyptic number.

61891544054 is a deficient number, since it is larger than the sum of its proper divisors (40680632554).

61891544054 is a wasteful number, since it uses less digits than its factorization.

61891544054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79145239.

The product of its (nonzero) digits is 691200, while the sum is 47.

The spelling of 61891544054 in words is "sixty-one billion, eight hundred ninety-one million, five hundred forty-four thousand, fifty-four".