1803972661664 has 12 divisors (see below), whose sum is σ = 3551571177714. Its totient is φ = 901986330816.

The previous prime is 1803972661663. The next prime is 1803972661681. The reversal of 1803972661664 is 4661662793081.

It can be written as a sum of positive squares in only one way, i.e., 1743170965264 + 60801696400 = 1320292^2 + 246580^2 .

It is not an unprimeable number, because it can be changed into a prime (1803972661663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28187072807 + ... + 28187072870.

Almost surely, 2^{1803972661664} is an apocalyptic number.

It is an amenable number.

1803972661664 is a deficient number, since it is larger than the sum of its proper divisors (1747598516050).

1803972661664 is an equidigital number, since it uses as much as digits as its factorization.

1803972661664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56374145687 (or 56374145679 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 59.

The spelling of 1803972661664 in words is "one trillion, eight hundred three billion, nine hundred seventy-two million, six hundred sixty-one thousand, six hundred sixty-four".