1623144540649 has 2 divisors, whose sum is σ = 1623144540650. Its totient is φ = 1623144540648.

The previous prime is 1623144540583. The next prime is 1623144540697. The reversal of 1623144540649 is 9460454413261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1313487905625 + 309656635024 = 1146075^2 + 556468^2 .

It is an emirp because it is prime and its reverse (9460454413261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1623144540649 - 2³⁵ = 1588784802281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1623144540749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811572270324 + 811572270325.

It is an arithmetic number, because the mean of its divisors is an integer number (811572270325).

Almost surely, 2^{1623144540649} is an apocalyptic number.

It is an amenable number.

1623144540649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623144540649 is an equidigital number, since it uses as much as digits as its factorization.

1623144540649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 1623144540649 in words is "one trillion, six hundred twenty-three billion, one hundred forty-four million, five hundred forty thousand, six hundred forty-nine".