561655166601 has 8 divisors (see below), whose sum is σ = 757287865440. Its totient is φ = 370229622752.

The previous prime is 561655166593. The next prime is 561655166603. The reversal of 561655166601 is 106661556165.

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

It is a cyclic number.

It is not a de Polignac number, because 561655166601 - 2³ = 561655166593 is a prime.

It is a super-3 number, since 3×561655166601³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (561655166603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1051788435 + ... + 1051788968.

It is an arithmetic number, because the mean of its divisors is an integer number (94660983180).

Almost surely, 2^561655166601 is an apocalyptic number.

It is an amenable number.

561655166601 is a deficient number, since it is larger than the sum of its proper divisors (195632698839).

561655166601 is a wasteful number, since it uses less digits than its factorization.

561655166601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103577495.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 561655166601 in words is "five hundred sixty-one billion, six hundred fifty-five million, one hundred sixty-six thousand, six hundred one".