61617520066 has 16 divisors (see below), whose sum is σ = 92965225248. Its totient is φ = 30629318400.

The previous prime is 61617520039. The next prime is 61617520123. The reversal of 61617520066 is 66002571616.

61617520066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555601 + ... + 657211.

It is an arithmetic number, because the mean of its divisors is an integer number (5810326578).

Almost surely, 2^61617520066 is an apocalyptic number.

61617520066 is a deficient number, since it is larger than the sum of its proper divisors (31347705182).

61617520066 is a wasteful number, since it uses less digits than its factorization.

61617520066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103377.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 61617520066 in words is "sixty-one billion, six hundred seventeen million, five hundred twenty thousand, sixty-six".