1966621648453 has 8 divisors (see below), whose sum is σ = 2451891925440. Its totient is φ = 1532432453280.

The previous prime is 1966621648421. The next prime is 1966621648499. The reversal of 1966621648453 is 3548461266691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1966621648453 - 2⁵ = 1966621648421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1966621648391 and 1966621648400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966621648153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12770270368 + ... + 12770270521.

It is an arithmetic number, because the mean of its divisors is an integer number (306486490680).

Almost surely, 2^{1966621648453} is an apocalyptic number.

It is an amenable number.

1966621648453 is a deficient number, since it is larger than the sum of its proper divisors (485270276987).

1966621648453 is a wasteful number, since it uses less digits than its factorization.

1966621648453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25540540907.

The product of its digits is 44789760, while the sum is 61.

The spelling of 1966621648453 in words is "one trillion, nine hundred sixty-six billion, six hundred twenty-one million, six hundred forty-eight thousand, four hundred fifty-three".