16212507869 has 2 divisors, whose sum is σ = 16212507870. Its totient is φ = 16212507868.

The previous prime is 16212507863. The next prime is 16212507931. The reversal of 16212507869 is 96870521261.

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., 14535195844 + 1677312025 = 120562^2 + 40955^2 .

It is a cyclic number.

It is not a de Polignac number, because 16212507869 - 2⁸ = 16212507613 is a prime.

It is a super-2 number, since 2×16212507869² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16212507863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8106253934 + 8106253935.

It is an arithmetic number, because the mean of its divisors is an integer number (8106253935).

Almost surely, 2^16212507869 is an apocalyptic number.

It is an amenable number.

16212507869 is a deficient number, since it is larger than the sum of its proper divisors (1).

16212507869 is an equidigital number, since it uses as much as digits as its factorization.

16212507869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 16212507869 in words is "sixteen billion, two hundred twelve million, five hundred seven thousand, eight hundred sixty-nine".