16620653771 has 2 divisors, whose sum is σ = 16620653772. Its totient is φ = 16620653770.

The previous prime is 16620653767. The next prime is 16620653821. The reversal of 16620653771 is 17735602661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16620653771 - 2² = 16620653767 is a prime.

It is a super-2 number, since 2×16620653771² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16620653741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8310326885 + 8310326886.

It is an arithmetic number, because the mean of its divisors is an integer number (8310326886).

Almost surely, 2^16620653771 is an apocalyptic number.

16620653771 is a deficient number, since it is larger than the sum of its proper divisors (1).

16620653771 is an equidigital number, since it uses as much as digits as its factorization.

16620653771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 16620653771 in words is "sixteen billion, six hundred twenty million, six hundred fifty-three thousand, seven hundred seventy-one".