1645994995461 has 6 divisors (see below), whose sum is σ = 2377548326790. Its totient is φ = 1097329996968.

The previous prime is 1645994995457. The next prime is 1645994995559.

It is a happy number.

1645994995461 is a `hidden beast` number, since 1 + 6 + 4 + 5 + 99 + 499 + 5 + 46 + 1 = 666.

1645994995461 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 1641960332100 + 4034663361 = 1281390^2 + 63519^2 .

It is not a de Polignac number, because 1645994995461 - 2² = 1645994995457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645994995461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645994995661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91444166406 + ... + 91444166423.

It is an arithmetic number, because the mean of its divisors is an integer number (396258054465).

Almost surely, 2^{1645994995461} is an apocalyptic number.

It is an amenable number.

1645994995461 is a deficient number, since it is larger than the sum of its proper divisors (731553331329).

1645994995461 is a wasteful number, since it uses less digits than its factorization.

1645994995461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182888332835 (or 182888332832 counting only the distinct ones).

The product of its digits is 377913600, while the sum is 72.

The spelling of 1645994995461 in words is "one trillion, six hundred forty-five billion, nine hundred ninety-four million, nine hundred ninety-five thousand, four hundred sixty-one".