11531642066 has 48 divisors (see below), whose sum is σ = 21017076480. Its totient is φ = 4722600960.

The previous prime is 11531642063. The next prime is 11531642069. The reversal of 11531642066 is 66024613511.

It is an interprime number because it is at equal distance from previous prime (11531642063) and next prime (11531642069).

It is not an unprimeable number, because it can be changed into a prime (11531642063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3174071 + ... + 3177701.

It is an arithmetic number, because the mean of its divisors is an integer number (437855760).

Almost surely, 2^11531642066 is an apocalyptic number.

11531642066 is a deficient number, since it is larger than the sum of its proper divisors (9485434414).

11531642066 is a wasteful number, since it uses less digits than its factorization.

11531642066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5079 (or 5072 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 11531642066 in words is "eleven billion, five hundred thirty-one million, six hundred forty-two thousand, sixty-six".