61205544678 has 16 divisors (see below), whose sum is σ = 122456678400. Its totient is φ = 20394250056.

The previous prime is 61205544677. The next prime is 61205544691. The reversal of 61205544678 is 87644550216.

It is a super-2 number, since 2×61205544678² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61205544671) by changing a digit.

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, 1882078 + ... + 1914321.

It is an arithmetic number, because the mean of its divisors is an integer number (7653542400).

Almost surely, 2^61205544678 is an apocalyptic number.

61205544678 is an abundant number, since it is smaller than the sum of its proper divisors (61251133722).

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

61205544678 is a wasteful number, since it uses less digits than its factorization.

61205544678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3799091.

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 61205544678 in words is "sixty-one billion, two hundred five million, five hundred forty-four thousand, six hundred seventy-eight".