10656021577 has 2 divisors, whose sum is σ = 10656021578. Its totient is φ = 10656021576.

The previous prime is 10656021569. The next prime is 10656021611. The reversal of 10656021577 is 77512065601.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6540927376 + 4115094201 = 80876^2 + 64149^2 .

It is an emirp because it is prime and its reverse (77512065601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10656021577 - 2³ = 10656021569 is a prime.

It is a super-2 number, since 2×10656021577² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10656021517) 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 as a sum of consecutive naturals, namely, 5328010788 + 5328010789.

It is an arithmetic number, because the mean of its divisors is an integer number (5328010789).

Almost surely, 2^10656021577 is an apocalyptic number.

It is an amenable number.

10656021577 is a deficient number, since it is larger than the sum of its proper divisors (1).

10656021577 is an equidigital number, since it uses as much as digits as its factorization.

10656021577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88200, while the sum is 40.

The spelling of 10656021577 in words is "ten billion, six hundred fifty-six million, twenty-one thousand, five hundred seventy-seven".