1661454618 has 8 divisors (see below), whose sum is σ = 3322909248. Its totient is φ = 553818204.

The previous prime is 1661454593. The next prime is 1661454643. The reversal of 1661454618 is 8164541661.

It is an interprime number because it is at equal distance from previous prime (1661454593) and next prime (1661454643).

It is a sphenic number, since it is the product of 3 distinct primes.

1661454618 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1661454618.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138454546 + ... + 138454557.

It is an arithmetic number, because the mean of its divisors is an integer number (415363656).

Almost surely, 2^1661454618 is an apocalyptic number.

1661454618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661454618 is a wasteful number, since it uses less digits than its factorization.

1661454618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276909108.

The product of its digits is 138240, while the sum is 42.

The square root of 1661454618 is about 40760.9447633393. The cubic root of 1661454618 is about 1184.3938975252.

The spelling of 1661454618 in words is "one billion, six hundred sixty-one million, four hundred fifty-four thousand, six hundred eighteen".