1661498527 has 4 divisors (see below), whose sum is σ = 1789306120. Its totient is φ = 1533690936.

The previous prime is 1661498521. The next prime is 1661498557. The reversal of 1661498527 is 7258941661.

It is a happy number.

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 1661498527 - 2¹⁵ = 1661465759 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 (1661498521) 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, 63903777 + ... + 63903802.

It is an arithmetic number, because the mean of its divisors is an integer number (447326530).

Almost surely, 2^1661498527 is an apocalyptic number.

1661498527 is a deficient number, since it is larger than the sum of its proper divisors (127807593).

1661498527 is a wasteful number, since it uses less digits than its factorization.

1661498527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127807592.

The product of its digits is 725760, while the sum is 49.

The square root of 1661498527 is about 40761.4833758537. The cubic root of 1661498527 is about 1184.4043311723.

The spelling of 1661498527 in words is "one billion, six hundred sixty-one million, four hundred ninety-eight thousand, five hundred twenty-seven".