61805285487 has 12 divisors (see below), whose sum is σ = 97390146984. Its totient is φ = 37457748720.

The previous prime is 61805285483. The next prime is 61805285501. The reversal of 61805285487 is 78458250816.

61805285487 is a `hidden beast` number, since 6 + 1 + 80 + 5 + 2 + 85 + 487 = 666.

It is not a de Polignac number, because 61805285487 - 2² = 61805285483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61805285483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312147808 + ... + 312148005.

It is an arithmetic number, because the mean of its divisors is an integer number (8115845582).

Almost surely, 2^61805285487 is an apocalyptic number.

61805285487 is a deficient number, since it is larger than the sum of its proper divisors (35584861497).

61805285487 is a wasteful number, since it uses less digits than its factorization.

61805285487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624295830 (or 624295827 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 54.

The spelling of 61805285487 in words is "sixty-one billion, eight hundred five million, two hundred eighty-five thousand, four hundred eighty-seven".