61505666854 has 8 divisors (see below), whose sum is σ = 92345294160. Its totient is φ = 30723902136.

The previous prime is 61505666843. The next prime is 61505666869. The reversal of 61505666854 is 45866650516.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 14462989 + ... + 14467240.

It is an arithmetic number, because the mean of its divisors is an integer number (11543161770).

Almost surely, 2^61505666854 is an apocalyptic number.

61505666854 is a deficient number, since it is larger than the sum of its proper divisors (30839627306).

61505666854 is a wasteful number, since it uses less digits than its factorization.

61505666854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28931294.

The product of its (nonzero) digits is 5184000, while the sum is 52.

The spelling of 61505666854 in words is "sixty-one billion, five hundred five million, six hundred sixty-six thousand, eight hundred fifty-four".