61061660551649 has 16 divisors (see below), whose sum is σ = 63187418304000. Its totient is φ = 58937251410240.

The previous prime is 61061660551637. The next prime is 61061660551673. The reversal of 61061660551649 is 94615506616016.

It is a cyclic number.

It is not a de Polignac number, because 61061660551649 - 2²⁰ = 61061659503073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61061660551594 and 61061660551603.

It is not an unprimeable number, because it can be changed into a prime (61061660551349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1578984584 + ... + 1579023254.

It is an arithmetic number, because the mean of its divisors is an integer number (3949213644000).

Almost surely, 2^{61061660551649} is an apocalyptic number.

It is an amenable number.

61061660551649 is a deficient number, since it is larger than the sum of its proper divisors (2125757752351).

61061660551649 is a wasteful number, since it uses less digits than its factorization.

61061660551649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54688.

The product of its (nonzero) digits is 6998400, while the sum is 56.

The spelling of 61061660551649 in words is "sixty-one trillion, sixty-one billion, six hundred sixty million, five hundred fifty-one thousand, six hundred forty-nine".