1666051053 has 4 divisors (see below), whose sum is σ = 2221401408. Its totient is φ = 1110700700.

The previous prime is 1666051021. The next prime is 1666051091. The reversal of 1666051053 is 3501506661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1666051053 - 2⁵ = 1666051021 is a prime.

It is a super-2 number, since 2×1666051053² = 5551452222404817618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666051003) 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, 277675173 + ... + 277675178.

It is an arithmetic number, because the mean of its divisors is an integer number (555350352).

Almost surely, 2^1666051053 is an apocalyptic number.

It is an amenable number.

1666051053 is a deficient number, since it is larger than the sum of its proper divisors (555350355).

1666051053 is an equidigital number, since it uses as much as digits as its factorization.

1666051053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555350354.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 1666051053 is about 40817.2886532165. The cubic root of 1666051053 is about 1185.4851053778.

The spelling of 1666051053 in words is "one billion, six hundred sixty-six million, fifty-one thousand, fifty-three".