61020017106665 has 8 divisors (see below), whose sum is σ = 73226617201608. Its totient is φ = 48814282569600.

The previous prime is 61020017106641. The next prime is 61020017106691. The reversal of 61020017106665 is 56660171002016.

It can be written as a sum of positive squares in 4 ways, for example, as 1243182630361 + 59776834476304 = 1114981^2 + 7731548^2 .

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

It is not a de Polignac number, because 61020017106665 - 2²² = 61020012912361 is a prime.

It is a super-3 number, since 3×61020017106665³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216234362 + ... + 216516371.

It is an arithmetic number, because the mean of its divisors is an integer number (9153327150201).

Almost surely, 2^{61020017106665} is an apocalyptic number.

It is an amenable number.

61020017106665 is a deficient number, since it is larger than the sum of its proper divisors (12206600094943).

61020017106665 is a wasteful number, since it uses less digits than its factorization.

61020017106665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432778939.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 61020017106665 in words is "sixty-one trillion, twenty billion, seventeen million, one hundred six thousand, six hundred sixty-five".