61656755571 has 6 divisors (see below), whose sum is σ = 89059758060. Its totient is φ = 41104503708.

The previous prime is 61656755549. The next prime is 61656755599. The reversal of 61656755571 is 17555765616.

61656755571 is a `hidden beast` number, since 6 + 1 + 6 + 5 + 67 + 5 + 5 + 571 = 666.

It is not a de Polignac number, because 61656755571 - 2¹³ = 61656747379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61656754571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3425375301 + ... + 3425375318.

It is an arithmetic number, because the mean of its divisors is an integer number (14843293010).

Almost surely, 2^61656755571 is an apocalyptic number.

61656755571 is a deficient number, since it is larger than the sum of its proper divisors (27403002489).

61656755571 is a wasteful number, since it uses less digits than its factorization.

61656755571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6850750625 (or 6850750622 counting only the distinct ones).

The product of its digits is 6615000, while the sum is 54.

The spelling of 61656755571 in words is "sixty-one billion, six hundred fifty-six million, seven hundred fifty-five thousand, five hundred seventy-one".