1618660471 has 4 divisors (see below), whose sum is σ = 1620944200. Its totient is φ = 1616376744.

The previous prime is 1618660453. The next prime is 1618660513. The reversal of 1618660471 is 1740668161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1740668161 = 41 ⋅42455321.

It is a cyclic number.

It is not a de Polignac number, because 1618660471 - 2¹³ = 1618652279 is a prime.

It is a super-3 number, since 3×1618660471³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618664471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1140801 + ... + 1142218.

It is an arithmetic number, because the mean of its divisors is an integer number (405236050).

Almost surely, 2^1618660471 is an apocalyptic number.

1618660471 is a deficient number, since it is larger than the sum of its proper divisors (2283729).

1618660471 is an equidigital number, since it uses as much as digits as its factorization.

1618660471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283728.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1618660471 is about 40232.5797209177. The cubic root of 1618660471 is about 1174.1364945241.

The spelling of 1618660471 in words is "one billion, six hundred eighteen million, six hundred sixty thousand, four hundred seventy-one".