61156616651 has 16 divisors (see below), whose sum is σ = 66000953088. Its totient is φ = 56332416000.

The previous prime is 61156616581. The next prime is 61156616671. The reversal of 61156616651 is 15661665116.

It is a cyclic number.

It is not a de Polignac number, because 61156616651 - 2¹⁸ = 61156354507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61156616671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21832451 + ... + 21835251.

It is an arithmetic number, because the mean of its divisors is an integer number (4125059568).

Almost surely, 2^61156616651 is an apocalyptic number.

61156616651 is a deficient number, since it is larger than the sum of its proper divisors (4844336437).

61156616651 is a wasteful number, since it uses less digits than its factorization.

61156616651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5782.

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

The spelling of 61156616651 in words is "sixty-one billion, one hundred fifty-six million, six hundred sixteen thousand, six hundred fifty-one".