61656561001061 has 8 divisors (see below), whose sum is σ = 66412441627224. Its totient is φ = 56902547266560.

The previous prime is 61656561001051. The next prime is 61656561001093. The reversal of 61656561001061 is 16010016565616.

It can be written as a sum of positive squares in 4 ways, for example, as 92921938561 + 61563639062500 = 304831^2 + 7846250^2 .

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 61656561001061 - 2⁶ = 61656561000997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61656561001051) 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, 466654316 + ... + 466786421.

It is an arithmetic number, because the mean of its divisors is an integer number (8301555203403).

Almost surely, 2^{61656561001061} is an apocalyptic number.

It is an amenable number.

61656561001061 is a deficient number, since it is larger than the sum of its proper divisors (4755880626163).

61656561001061 is a wasteful number, since it uses less digits than its factorization.

61656561001061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933445831.

The product of its (nonzero) digits is 194400, while the sum is 44.

Adding to 61656561001061 its reverse (16010016565616), we get a palindrome (77666577566677).

The spelling of 61656561001061 in words is "sixty-one trillion, six hundred fifty-six billion, five hundred sixty-one million, one thousand, sixty-one".