1964726445969 has 135 divisors (see below), whose sum is σ = 3606367867641. Its totient is φ = 1062703015920.

The previous prime is 1964726445959. The next prime is 1964726445991. The reversal of 1964726445969 is 9695446274691.

It is a happy number.

The square root of 1964726445969 is 1401687.

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

1964726445969 is a `hidden beast` number, since 1 + 9 + 6 + 4 + 7 + 26 + 4 + 4 + 596 + 9 = 666.

It is not a de Polignac number, because 1964726445969 - 2¹⁹ = 1964725921681 is a prime.

It is a super-2 number, since 2×1964726445969² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1964726445897 and 1964726445906.

It is not an unprimeable number, because it can be changed into a prime (1964726445959) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 1677818754 + ... + 1677819924.

Almost surely, 2^{1964726445969} is an apocalyptic number.

1964726445969 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1964726445969 is the 1401687-th square number.

1964726445969 is the 700844-th centered octagonal number.

It is an amenable number.

1964726445969 is a deficient number, since it is larger than the sum of its proper divisors (1641641421672).

1964726445969 is an frugal number, since it uses more digits than its factorization.

1964726445969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2406 (or 1200 counting only the distinct ones).

The product of its digits is 705438720, while the sum is 72.

The spelling of 1964726445969 in words is "one trillion, nine hundred sixty-four billion, seven hundred twenty-six million, four hundred forty-five thousand, nine hundred sixty-nine".