1643740473461 has 16 divisors (see below), whose sum is σ = 1751819747328. Its totient is φ = 1538716753200.

The previous prime is 1643740473433. The next prime is 1643740473497.

1643740473461 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-1643740473461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643740473961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19297676 + ... + 19382666.

It is an arithmetic number, because the mean of its divisors is an integer number (109488734208).

Almost surely, 2^{1643740473461} is an apocalyptic number.

It is an amenable number.

1643740473461 is a deficient number, since it is larger than the sum of its proper divisors (108079273867).

1643740473461 is a wasteful number, since it uses less digits than its factorization.

1643740473461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102952.

The product of its (nonzero) digits is 4064256, while the sum is 50.

The spelling of 1643740473461 in words is "one trillion, six hundred forty-three billion, seven hundred forty million, four hundred seventy-three thousand, four hundred sixty-one".