61601510616666 has 8 divisors (see below), whose sum is σ = 123203021233344. Its totient is φ = 20533836872220.

The previous prime is 61601510616593. The next prime is 61601510616671. The reversal of 61601510616666 is 66661601510616.

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

61601510616666 is an admirable number.

It is a super-2 number, since 2×61601510616666² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5133459218050 + ... + 5133459218061.

It is an arithmetic number, because the mean of its divisors is an integer number (15400377654168).

Almost surely, 2^{61601510616666} is an apocalyptic number.

61601510616666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61601510616666 is a wasteful number, since it uses less digits than its factorization.

61601510616666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10266918436116.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 61601510616666 in words is "sixty-one trillion, six hundred one billion, five hundred ten million, six hundred sixteen thousand, six hundred sixty-six".