1662247609 has 4 divisors (see below), whose sum is σ = 1813361040. Its totient is φ = 1511134180.

The previous prime is 1662247589. The next prime is 1662247627. The reversal of 1662247609 is 9067422661.

It is a happy number.

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 1662247609 - 2²³ = 1653859001 is a prime.

It is a super-2 number, since 2×1662247609² = 5526134227252433762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662247649) 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, 75556699 + ... + 75556720.

It is an arithmetic number, because the mean of its divisors is an integer number (453340260).

Almost surely, 2^1662247609 is an apocalyptic number.

It is an amenable number.

1662247609 is a deficient number, since it is larger than the sum of its proper divisors (151113431).

1662247609 is a wasteful number, since it uses less digits than its factorization.

1662247609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151113430.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 1662247609 is about 40770.6709412538. The cubic root of 1662247609 is about 1184.5822995648.

The spelling of 1662247609 in words is "one billion, six hundred sixty-two million, two hundred forty-seven thousand, six hundred nine".