1945555555555 has 8 divisors (see below), whose sum is σ = 2334690964800. Its totient is φ = 1556428245696.

The previous prime is 1945555555553. The next prime is 1945555555577. The reversal of 1945555555555 is 5555555555491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1945555555555 - 2¹ = 1945555555553 is a prime.

1945555555555 is a modest number, since divided by 5555555 gives 194555 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1945555555553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1483210 + ... + 2467999.

It is an arithmetic number, because the mean of its divisors is an integer number (291836370600).

Almost surely, 2^{1945555555555} is an apocalyptic number.

1945555555555 is a deficient number, since it is larger than the sum of its proper divisors (389135409245).

1945555555555 is an equidigital number, since it uses as much as digits as its factorization.

1945555555555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4049693.

The product of its digits is 351562500, while the sum is 64.

Subtracting from 1945555555555 its sum of digits (64), we obtain a palindrome (1945555555491).

The spelling of 1945555555555 in words is "one trillion, nine hundred forty-five billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred fifty-five".