66465863542 has 32 divisors (see below), whose sum is σ = 112723607808. Its totient is φ = 29162729376.

The previous prime is 66465863537. The next prime is 66465863549. The reversal of 66465863542 is 24536856466.

It is a super-2 number, since 2×66465863542² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66465863549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243468 + ... + 438415.

It is an arithmetic number, because the mean of its divisors is an integer number (3522612744).

Almost surely, 2^66465863542 is an apocalyptic number.

66465863542 is a deficient number, since it is larger than the sum of its proper divisors (46257744266).

66465863542 is a wasteful number, since it uses less digits than its factorization.

66465863542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682084.

The product of its digits is 24883200, while the sum is 55.

The spelling of 66465863542 in words is "sixty-six billion, four hundred sixty-five million, eight hundred sixty-three thousand, five hundred forty-two".