1623664011645 has 128 divisors (see below), whose sum is σ = 3134610124800. Its totient is φ = 792655766784.

The previous prime is 1623664011623. The next prime is 1623664011653. The reversal of 1623664011645 is 5461104663261.

1623664011645 is a `hidden beast` number, since 1 + 6 + 23 + 66 + 401 + 164 + 5 = 666.

It is not a de Polignac number, because 1623664011645 - 2¹⁸ = 1623663749501 is a prime.

It is a super-2 number, since 2×1623664011645² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1623664011645.

It is a congruent number.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 235891374 + ... + 235898256.

It is an arithmetic number, because the mean of its divisors is an integer number (24489141600).

Almost surely, 2^{1623664011645} is an apocalyptic number.

1623664011645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1623664011645 is a deficient number, since it is larger than the sum of its proper divisors (1510946113155).

1623664011645 is a wasteful number, since it uses less digits than its factorization.

1623664011645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8016 (or 8010 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 1623664011645 in words is "one trillion, six hundred twenty-three billion, six hundred sixty-four million, eleven thousand, six hundred forty-five".