561011661501 has 8 divisors (see below), whose sum is σ = 772145082624. Its totient is φ = 361943007360.

The previous prime is 561011661479. The next prime is 561011661571. The reversal of 561011661501 is 105166110165.

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

It is not a de Polignac number, because 561011661501 - 2⁶ = 561011661437 is a prime.

It is a super-2 number, since 2×561011661501² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561011661571) 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, 3016191636 + ... + 3016191821.

It is an arithmetic number, because the mean of its divisors is an integer number (96518135328).

Almost surely, 2^561011661501 is an apocalyptic number.

It is an amenable number.

561011661501 is a deficient number, since it is larger than the sum of its proper divisors (211133421123).

561011661501 is a wasteful number, since it uses less digits than its factorization.

561011661501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6032383491.

The product of its (nonzero) digits is 5400, while the sum is 33.

Adding to 561011661501 its reverse (105166110165), we get a palindrome (666177771666).

The spelling of 561011661501 in words is "five hundred sixty-one billion, eleven million, six hundred sixty-one thousand, five hundred one".