1623331621545 has 16 divisors (see below), whose sum is σ = 2750114747520. Its totient is φ = 814848813824.

The previous prime is 1623331621441. The next prime is 1623331621547. The reversal of 1623331621545 is 5451261333261.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1623331621545 - 2²¹ = 1623329524393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1623331621497 and 1623331621506.

It is not an unprimeable number, because it can be changed into a prime (1623331621547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3183002925 + ... + 3183003434.

It is an arithmetic number, because the mean of its divisors is an integer number (171882171720).

Almost surely, 2^{1623331621545} is an apocalyptic number.

1623331621545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1623331621545 is a deficient number, since it is larger than the sum of its proper divisors (1126783125975).

1623331621545 is a wasteful number, since it uses less digits than its factorization.

1623331621545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6366006384.

The product of its digits is 388800, while the sum is 42.

The spelling of 1623331621545 in words is "one trillion, six hundred twenty-three billion, three hundred thirty-one million, six hundred twenty-one thousand, five hundred forty-five".