1663661526 has 16 divisors (see below), whose sum is σ = 3349360128. Its totient is φ = 550881000.

The previous prime is 1663661477. The next prime is 1663661537. The reversal of 1663661526 is 6251663661.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 917230 + ... + 919041.

It is an arithmetic number, because the mean of its divisors is an integer number (209335008).

Almost surely, 2^1663661526 is an apocalyptic number.

1663661526 is an abundant number, since it is smaller than the sum of its proper divisors (1685698602).

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

1663661526 is a wasteful number, since it uses less digits than its factorization.

1663661526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836427.

The product of its digits is 233280, while the sum is 42.

The square root of 1663661526 is about 40788.0071344507. The cubic root of 1663661526 is about 1184.9180751282.

The spelling of 1663661526 in words is "one billion, six hundred sixty-three million, six hundred sixty-one thousand, five hundred twenty-six".