61561454546 has 8 divisors (see below), whose sum is σ = 92544244860. Its totient is φ = 30713372928.

The previous prime is 61561454543. The next prime is 61561454551. The reversal of 61561454546 is 64545416516.

It can be written as a sum of positive squares in 2 ways, for example, as 45460636225 + 16100818321 = 213215^2 + 126889^2 .

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

It is a super-2 number, since 2×61561454546² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61561454546.

It is not an unprimeable number, because it can be changed into a prime (61561454543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33676031 + ... + 33677858.

Almost surely, 2^61561454546 is an apocalyptic number.

61561454546 is a deficient number, since it is larger than the sum of its proper divisors (30982790314).

61561454546 is a wasteful number, since it uses less digits than its factorization.

61561454546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67354348.

The product of its digits is 1728000, while the sum is 47.

The spelling of 61561454546 in words is "sixty-one billion, five hundred sixty-one million, four hundred fifty-four thousand, five hundred forty-six".