66640235535 has 96 divisors (see below), whose sum is σ = 127904624640. Its totient is φ = 31925566464.

The previous prime is 66640235533. The next prime is 66640235537. The reversal of 66640235535 is 53553204666.

It is an interprime number because it is at equal distance from previous prime (66640235533) and next prime (66640235537).

It is not a de Polignac number, because 66640235535 - 2¹ = 66640235533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66640235533) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8424052 + ... + 8431958.

It is an arithmetic number, because the mean of its divisors is an integer number (1332339840).

Almost surely, 2^66640235535 is an apocalyptic number.

66640235535 is a deficient number, since it is larger than the sum of its proper divisors (61264389105).

66640235535 is a wasteful number, since it uses less digits than its factorization.

66640235535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8437 (or 8434 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 45.

The spelling of 66640235535 in words is "sixty-six billion, six hundred forty million, two hundred thirty-five thousand, five hundred thirty-five".