16628586971 has 2 divisors, whose sum is σ = 16628586972. Its totient is φ = 16628586970.

The previous prime is 16628586893. The next prime is 16628586977. The reversal of 16628586971 is 17968582661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16628586971 is a prime.

It is a super-2 number, since 2×16628586971² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16628586971.

It is not a weakly prime, because it can be changed into another prime (16628586977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8314293485 + 8314293486.

It is an arithmetic number, because the mean of its divisors is an integer number (8314293486).

Almost surely, 2^16628586971 is an apocalyptic number.

16628586971 is a deficient number, since it is larger than the sum of its proper divisors (1).

16628586971 is an equidigital number, since it uses as much as digits as its factorization.

16628586971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 59.

The spelling of 16628586971 in words is "sixteen billion, six hundred twenty-eight million, five hundred eighty-six thousand, nine hundred seventy-one".