1661541627 has 8 divisors (see below), whose sum is σ = 2286853120. Its totient is φ = 1071962280.

The previous prime is 1661541619. The next prime is 1661541653. The reversal of 1661541627 is 7261451661.

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

It is not a de Polignac number, because 1661541627 - 2³ = 1661541619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661541527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8932927 + ... + 8933112.

It is an arithmetic number, because the mean of its divisors is an integer number (285856640).

Almost surely, 2^1661541627 is an apocalyptic number.

1661541627 is a deficient number, since it is larger than the sum of its proper divisors (625311493).

1661541627 is a wasteful number, since it uses less digits than its factorization.

1661541627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17866073.

The product of its digits is 60480, while the sum is 39.

The square root of 1661541627 is about 40762.0120577971. The cubic root of 1661541627 is about 1184.4145724063.

The spelling of 1661541627 in words is "one billion, six hundred sixty-one million, five hundred forty-one thousand, six hundred twenty-seven".