66400562552 has 16 divisors (see below), whose sum is σ = 124901384400. Its totient is φ = 33093526720.

The previous prime is 66400562537. The next prime is 66400562587. The reversal of 66400562552 is 25526500466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13341677 + ... + 13346652.

It is an arithmetic number, because the mean of its divisors is an integer number (7806336525).

Almost surely, 2^66400562552 is an apocalyptic number.

It is an amenable number.

66400562552 is a deficient number, since it is larger than the sum of its proper divisors (58500821848).

66400562552 is a wasteful number, since it uses less digits than its factorization.

66400562552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26688646 (or 26688642 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 66400562552 in words is "sixty-six billion, four hundred million, five hundred sixty-two thousand, five hundred fifty-two".