1643462461553 has 12 divisors (see below), whose sum is σ = 1810070682000. Its totient is φ = 1491062626680.

The previous prime is 1643462461519. The next prime is 1643462461591. The reversal of 1643462461553 is 3551642643461.

It is a happy number.

It is not a de Polignac number, because 1643462461553 - 2¹² = 1643462457457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1643462161553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13549175 + ... + 13669932.

It is an arithmetic number, because the mean of its divisors is an integer number (150839223500).

Almost surely, 2^{1643462461553} is an apocalyptic number.

It is an amenable number.

1643462461553 is a deficient number, since it is larger than the sum of its proper divisors (166608220447).

1643462461553 is a wasteful number, since it uses less digits than its factorization.

1643462461553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27219628 (or 27219617 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 50.

The spelling of 1643462461553 in words is "one trillion, six hundred forty-three billion, four hundred sixty-two million, four hundred sixty-one thousand, five hundred fifty-three".