1662171553 has 4 divisors (see below), whose sum is σ = 1899624640. Its totient is φ = 1424718468.

The previous prime is 1662171551. The next prime is 1662171593. The reversal of 1662171553 is 3551712661.

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 1662171553 - 2¹ = 1662171551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662171551) 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, 118726533 + ... + 118726546.

It is an arithmetic number, because the mean of its divisors is an integer number (474906160).

Almost surely, 2^1662171553 is an apocalyptic number.

It is an amenable number.

1662171553 is a deficient number, since it is larger than the sum of its proper divisors (237453087).

1662171553 is an equidigital number, since it uses as much as digits as its factorization.

1662171553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237453086.

The product of its digits is 37800, while the sum is 37.

The square root of 1662171553 is about 40769.7382012688. The cubic root of 1662171553 is about 1184.5642324679.

The spelling of 1662171553 in words is "one billion, six hundred sixty-two million, one hundred seventy-one thousand, five hundred fifty-three".