61565231478 has 16 divisors (see below), whose sum is σ = 123298453296. Its totient is φ = 20493745440.

The previous prime is 61565231471. The next prime is 61565231489. The reversal of 61565231478 is 87413256516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61565231471) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6994833 + ... + 7003628.

It is an arithmetic number, because the mean of its divisors is an integer number (7706153331).

Almost surely, 2^61565231478 is an apocalyptic number.

61565231478 is an abundant number, since it is smaller than the sum of its proper divisors (61733221818).

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

61565231478 is a wasteful number, since it uses less digits than its factorization.

61565231478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13999199.

The product of its digits is 1209600, while the sum is 48.

The spelling of 61565231478 in words is "sixty-one billion, five hundred sixty-five million, two hundred thirty-one thousand, four hundred seventy-eight".