61715990566 has 8 divisors (see below), whose sum is σ = 92623416984. Its totient is φ = 30841518240.

The previous prime is 61715990561. The next prime is 61715990593. The reversal of 61715990566 is 66509951716.

61715990566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61715990561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8233840 + ... + 8241331.

It is an arithmetic number, because the mean of its divisors is an integer number (11577927123).

Almost surely, 2^61715990566 is an apocalyptic number.

61715990566 is a deficient number, since it is larger than the sum of its proper divisors (30907426418).

61715990566 is a wasteful number, since it uses less digits than its factorization.

61715990566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16477046.

The product of its (nonzero) digits is 3061800, while the sum is 55.

The spelling of 61715990566 in words is "sixty-one billion, seven hundred fifteen million, nine hundred ninety thousand, five hundred sixty-six".