1620448267473 has 32 divisors (see below), whose sum is σ = 2746999377920. Its totient is φ = 924828587280.

The previous prime is 1620448267469. The next prime is 1620448267481. The reversal of 1620448267473 is 3747628440261.

1620448267473 is a `hidden beast` number, since 1 + 6 + 20 + 4 + 482 + 6 + 74 + 73 = 666.

It is not a de Polignac number, because 1620448267473 - 2² = 1620448267469 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1620448217473) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5132665 + ... + 5439222.

It is an arithmetic number, because the mean of its divisors is an integer number (85843730560).

Almost surely, 2^{1620448267473} is an apocalyptic number.

It is an amenable number.

1620448267473 is a deficient number, since it is larger than the sum of its proper divisors (1126551110447).

1620448267473 is a wasteful number, since it uses less digits than its factorization.

1620448267473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10572714 (or 10572708 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 54.

The spelling of 1620448267473 in words is "one trillion, six hundred twenty billion, four hundred forty-eight million, two hundred sixty-seven thousand, four hundred seventy-three".