656124005661 has 16 divisors (see below), whose sum is σ = 875426606208. Its totient is φ = 437118796800.

The previous prime is 656124005639. The next prime is 656124005683. The reversal of 656124005661 is 166500421656.

It is an interprime number because it is at equal distance from previous prime (656124005639) and next prime (656124005683).

It is not a de Polignac number, because 656124005661 - 2¹³ = 656123997469 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656120005661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51089601 + ... + 51102441.

It is an arithmetic number, because the mean of its divisors is an integer number (54714162888).

Almost surely, 2^656124005661 is an apocalyptic number.

It is an amenable number.

656124005661 is a deficient number, since it is larger than the sum of its proper divisors (219302600547).

656124005661 is a wasteful number, since it uses less digits than its factorization.

656124005661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23092.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 656124005661 in words is "six hundred fifty-six billion, one hundred twenty-four million, five thousand, six hundred sixty-one".