1662610871 has 4 divisors (see below), whose sum is σ = 1669080432. Its totient is φ = 1656141312.

The previous prime is 1662610837. The next prime is 1662610889. The reversal of 1662610871 is 1780162661.

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

It is a cyclic number.

It is not a de Polignac number, because 1662610871 - 2¹⁰ = 1662609847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662610801) 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, 3234395 + ... + 3234908.

It is an arithmetic number, because the mean of its divisors is an integer number (417270108).

Almost surely, 2^1662610871 is an apocalyptic number.

1662610871 is a deficient number, since it is larger than the sum of its proper divisors (6469561).

1662610871 is an equidigital number, since it uses as much as digits as its factorization.

1662610871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6469560.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 1662610871 is about 40775.1256405177. The cubic root of 1662610871 is about 1184.6685848230.

The spelling of 1662610871 in words is "one billion, six hundred sixty-two million, six hundred ten thousand, eight hundred seventy-one".