66433507440 has 80 divisors (see below), whose sum is σ = 208067078688. Its totient is φ = 17532960768.

The previous prime is 66433507423. The next prime is 66433507457. The reversal of 66433507440 is 4470533466.

It is an interprime number because it is at equal distance from previous prime (66433507423) and next prime (66433507457).

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 66433507392 and 66433507401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1403557 + ... + 1450116.

Almost surely, 2^66433507440 is an apocalyptic number.

66433507440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66433507440 is an abundant number, since it is smaller than the sum of its proper divisors (141633571248).

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

66433507440 is a wasteful number, since it uses less digits than its factorization.

66433507440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2853786 (or 2853780 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 42.

The spelling of 66433507440 in words is "sixty-six billion, four hundred thirty-three million, five hundred seven thousand, four hundred forty".