66641567546 has 16 divisors (see below), whose sum is σ = 101679295680. Its totient is φ = 32748720960.

The previous prime is 66641567521. The next prime is 66641567549. The reversal of 66641567546 is 64576514666.

It is a junction number, because it is equal to n+sod(n) for n = 66641567491 and 66641567500.

It is not an unprimeable number, because it can be changed into a prime (66641567549) 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 7 ways as a sum of consecutive naturals, for example, 488891 + ... + 610161.

It is an arithmetic number, because the mean of its divisors is an integer number (6354955980).

Almost surely, 2^66641567546 is an apocalyptic number.

66641567546 is a deficient number, since it is larger than the sum of its proper divisors (35037728134).

66641567546 is a wasteful number, since it uses less digits than its factorization.

66641567546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125989.

The product of its digits is 21772800, while the sum is 56.

The spelling of 66641567546 in words is "sixty-six billion, six hundred forty-one million, five hundred sixty-seven thousand, five hundred forty-six".