11656620851 has 2 divisors, whose sum is σ = 11656620852. Its totient is φ = 11656620850.

The previous prime is 11656620841. The next prime is 11656620887. The reversal of 11656620851 is 15802665611.

It is a weak prime.

It is an emirp because it is prime and its reverse (15802665611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11656620851 - 2¹⁰ = 11656619827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11656620799 and 11656620808.

It is not a weakly prime, because it can be changed into another prime (11656620841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5828310425 + 5828310426.

It is an arithmetic number, because the mean of its divisors is an integer number (5828310426).

Almost surely, 2^11656620851 is an apocalyptic number.

11656620851 is a deficient number, since it is larger than the sum of its proper divisors (1).

11656620851 is an equidigital number, since it uses as much as digits as its factorization.

11656620851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 11656620851 in words is "eleven billion, six hundred fifty-six million, six hundred twenty thousand, eight hundred fifty-one".