3645944793378 has 24 divisors (see below), whose sum is σ = 8010808281216. Its totient is φ = 1198197819000.

The previous prime is 3645944793367. The next prime is 3645944793383. The reversal of 3645944793378 is 8733974495463.

3645944793378 is a `hidden beast` number, since 3 + 6 + 4 + 59 + 4 + 479 + 33 + 78 = 666.

It is a super-2 number, since 2×3645944793378² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1426424698 + ... + 1426427253.

It is an arithmetic number, because the mean of its divisors is an integer number (333783678384).

Almost surely, 2^{3645944793378} is an apocalyptic number.

3645944793378 is an abundant number, since it is smaller than the sum of its proper divisors (4364863487838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3645944793378 is a wasteful number, since it uses less digits than its factorization.

3645944793378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852852030 (or 2852852027 counting only the distinct ones).

The product of its digits is 1646023680, while the sum is 72.

The spelling of 3645944793378 in words is "three trillion, six hundred forty-five billion, nine hundred forty-four million, seven hundred ninety-three thousand, three hundred seventy-eight".