65661155601 has 8 divisors (see below), whose sum is σ = 87677528064. Its totient is φ = 43709443440.

The previous prime is 65661155563. The next prime is 65661155629. The reversal of 65661155601 is 10655116656.

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

It is not a de Polignac number, because 65661155601 - 2¹⁷ = 65661024529 is a prime.

It is a super-2 number, since 2×65661155601² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65661155201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16162705 + ... + 16166766.

It is an arithmetic number, because the mean of its divisors is an integer number (10959691008).

Almost surely, 2^65661155601 is an apocalyptic number.

It is an amenable number.

65661155601 is a deficient number, since it is larger than the sum of its proper divisors (22016372463).

65661155601 is a wasteful number, since it uses less digits than its factorization.

65661155601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32330151.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 65661155601 in words is "sixty-five billion, six hundred sixty-one million, one hundred fifty-five thousand, six hundred one".