61666516602 has 24 divisors (see below), whose sum is σ = 133617504384. Its totient is φ = 20554471944.

The previous prime is 61666516589. The next prime is 61666516687. The reversal of 61666516602 is 20661566616.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 338313 + ... + 487635.

It is an arithmetic number, because the mean of its divisors is an integer number (5567396016).

Almost surely, 2^61666516602 is an apocalyptic number.

61666516602 is an abundant number, since it is smaller than the sum of its proper divisors (71950987782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61666516602 is a wasteful number, since it uses less digits than its factorization.

61666516602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172274 (or 172271 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 61666516602 in words is "sixty-one billion, six hundred sixty-six million, five hundred sixteen thousand, six hundred two".