1940866553 has 4 divisors (see below), whose sum is σ = 1941507828. Its totient is φ = 1940225280.

The previous prime is 1940866541. The next prime is 1940866567. The reversal of 1940866553 is 3556680491.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1398535609 + 542330944 = 37397^2 + 23288^2 .

It is a cyclic number.

It is not a de Polignac number, because 1940866553 - 2⁸ = 1940866297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1940866498 and 1940866507.

It is not an unprimeable number, because it can be changed into a prime (1940866253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316076 + ... + 322157.

It is an arithmetic number, because the mean of its divisors is an integer number (485376957).

Almost surely, 2^1940866553 is an apocalyptic number.

It is an amenable number.

1940866553 is a deficient number, since it is larger than the sum of its proper divisors (641275).

1940866553 is an equidigital number, since it uses as much as digits as its factorization.

1940866553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641274.

The product of its (nonzero) digits is 777600, while the sum is 47.

The square root of 1940866553 is about 44055.2670290398. The cubic root of 1940866553 is about 1247.3793743364.

The spelling of 1940866553 in words is "one billion, nine hundred forty million, eight hundred sixty-six thousand, five hundred fifty-three".