10721601655663 has 2 divisors, whose sum is σ = 10721601655664. Its totient is φ = 10721601655662.

The previous prime is 10721601655657. The next prime is 10721601655717. The reversal of 10721601655663 is 36655610612701.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10721601655663 - 2²¹ = 10721599558511 is a prime.

It is a super-3 number, since 3×10721601655663³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10721601625663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5360800827831 + 5360800827832.

It is an arithmetic number, because the mean of its divisors is an integer number (5360800827832).

Almost surely, 2^{10721601655663} is an apocalyptic number.

10721601655663 is a deficient number, since it is larger than the sum of its proper divisors (1).

10721601655663 is an equidigital number, since it uses as much as digits as its factorization.

10721601655663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 10721601655663 in words is "ten trillion, seven hundred twenty-one billion, six hundred one million, six hundred fifty-five thousand, six hundred sixty-three".