1623005621649 has 6 divisors (see below), whose sum is σ = 2344341453506. Its totient is φ = 1082003747760.

The previous prime is 1623005621609. The next prime is 1623005621651. The reversal of 1623005621649 is 9461265003261.

1623005621649 is a `hidden beast` number, since 1 + 6 + 2 + 30 + 0 + 562 + 16 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1100359040400 + 522646581249 = 1048980^2 + 722943^2 .

It is not a de Polignac number, because 1623005621649 - 2⁹ = 1623005621137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1623005621609) 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, 90166978972 + ... + 90166978989.

Almost surely, 2^{1623005621649} is an apocalyptic number.

It is an amenable number.

1623005621649 is a deficient number, since it is larger than the sum of its proper divisors (721335831857).

1623005621649 is a wasteful number, since it uses less digits than its factorization.

1623005621649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180333957967 (or 180333957964 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 1623005621649 in words is "one trillion, six hundred twenty-three billion, five million, six hundred twenty-one thousand, six hundred forty-nine".