61477809185 has 16 divisors (see below), whose sum is σ = 82011095040. Its totient is φ = 43934512320.

The previous prime is 61477809181. The next prime is 61477809229. The reversal of 61477809185 is 58190877416.

It is a happy number.

It is not a de Polignac number, because 61477809185 - 2² = 61477809181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61477809185.

It is not an unprimeable number, because it can be changed into a prime (61477809181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15253025 + ... + 15257054.

It is an arithmetic number, because the mean of its divisors is an integer number (5125693440).

Almost surely, 2^61477809185 is an apocalyptic number.

61477809185 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61477809185 is a deficient number, since it is larger than the sum of its proper divisors (20533285855).

61477809185 is a wasteful number, since it uses less digits than its factorization.

61477809185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30510128.

The product of its (nonzero) digits is 3386880, while the sum is 56.

The spelling of 61477809185 in words is "sixty-one billion, four hundred seventy-seven million, eight hundred nine thousand, one hundred eighty-five".