61586859889 has 3 divisors (see below), whose sum is σ = 61587108057. Its totient is φ = 61586611722.

The previous prime is 61586859883. The next prime is 61586859913. The reversal of 61586859889 is 98895868516.

The square root of 61586859889 is 248167.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-61586859889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61586859883) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 124084 + ... + 372250.

It is an arithmetic number, because the mean of its divisors is an integer number (20529036019).

Almost surely, 2^61586859889 is an apocalyptic number.

61586859889 is the 248167-th square number.

61586859889 is the 124084-th centered octagonal number.

It is an amenable number.

61586859889 is a deficient number, since it is larger than the sum of its proper divisors (248168).

61586859889 is an frugal number, since it uses more digits than its factorization.

61586859889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496334 (or 248167 counting only the distinct ones).

The product of its digits is 298598400, while the sum is 73.

The spelling of 61586859889 in words is "sixty-one billion, five hundred eighty-six million, eight hundred fifty-nine thousand, eight hundred eighty-nine".