66461005958 has 16 divisors (see below), whose sum is σ = 108323543040. Its totient is φ = 30465995400.

The previous prime is 66461005957. The next prime is 66461005993. The reversal of 66461005958 is 85950016466.

It is a happy number.

It is a super-2 number, since 2×66461005958² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66461005951) 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, 28208078 + ... + 28210433.

It is an arithmetic number, because the mean of its divisors is an integer number (6770221440).

Almost surely, 2^66461005958 is an apocalyptic number.

66461005958 is a deficient number, since it is larger than the sum of its proper divisors (41862537082).

66461005958 is a wasteful number, since it uses less digits than its factorization.

66461005958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56418563.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The spelling of 66461005958 in words is "sixty-six billion, four hundred sixty-one million, five thousand, nine hundred fifty-eight".