61611969951 has 16 divisors (see below), whose sum is σ = 104316563200. Its totient is φ = 35206839864.

The previous prime is 61611969917. The next prime is 61611969967. The reversal of 61611969951 is 15996911616.

61611969951 is a `hidden beast` number, since 616 + 1 + 19 + 6 + 9 + 9 + 5 + 1 = 666.

It is not a de Polignac number, because 61611969951 - 2¹¹ = 61611967903 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 (61611969971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162994441 + ... + 162994818.

It is an arithmetic number, because the mean of its divisors is an integer number (6519785200).

Almost surely, 2^61611969951 is an apocalyptic number.

61611969951 is a deficient number, since it is larger than the sum of its proper divisors (42704593249).

61611969951 is a wasteful number, since it uses less digits than its factorization.

61611969951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325989275 (or 325989269 counting only the distinct ones).

The product of its digits is 787320, while the sum is 54.

The spelling of 61611969951 in words is "sixty-one billion, six hundred eleven million, nine hundred sixty-nine thousand, nine hundred fifty-one".