8423420749969 has 27 divisors (see below), whose sum is σ = 8762215376187. Its totient is φ = 8097453270000.

The previous prime is 8423420749967. The next prime is 8423420749981. The reversal of 8423420749969 is 9699470243248.

The square root of 8423420749969 is 2902313.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4578637050625 + 3844783699344 = 2139775^2 + 1960812^2 .

It is not a de Polignac number, because 8423420749969 - 2¹ = 8423420749967 is a prime.

It is a super-2 number, since 2×8423420749969² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8423420749967) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 22582897267 + ... + 22582897639.

Almost surely, 2^{8423420749969} is an apocalyptic number.

8423420749969 is the 2902313-rd square number.

8423420749969 is the 1451157-th centered octagonal number.

It is an amenable number.

8423420749969 is a deficient number, since it is larger than the sum of its proper divisors (338794626218).

8423420749969 is an frugal number, since it uses more digits than its factorization.

8423420749969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 67.

The spelling of 8423420749969 in words is "eight trillion, four hundred twenty-three billion, four hundred twenty million, seven hundred forty-nine thousand, nine hundred sixty-nine".