61809055963 has 4 divisors (see below), whose sum is σ = 61813186920. Its totient is φ = 61804925008.

The previous prime is 61809055961. The next prime is 61809056063. The reversal of 61809055963 is 36955090816.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61809055963 - 2¹ = 61809055961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61809055963.

It is not an unprimeable number, because it can be changed into a prime (61809055961) 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 3 ways as a sum of consecutive naturals, for example, 2042953 + ... + 2072986.

It is an arithmetic number, because the mean of its divisors is an integer number (15453296730).

Almost surely, 2^61809055963 is an apocalyptic number.

61809055963 is a deficient number, since it is larger than the sum of its proper divisors (4130957).

61809055963 is a wasteful number, since it uses less digits than its factorization.

61809055963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130956.

The product of its (nonzero) digits is 1749600, while the sum is 52.

The spelling of 61809055963 in words is "sixty-one billion, eight hundred nine million, fifty-five thousand, nine hundred sixty-three".