666121452412510 has 16 divisors (see below), whose sum is σ = 1199018994187536. Its totient is φ = 266448496555008.

The previous prime is 666121452412459. The next prime is 666121452412511. The reversal of 666121452412510 is 15214254121666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666121452412511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30022777 + ... + 47261083.

It is an arithmetic number, because the mean of its divisors is an integer number (74938687136721).

Almost surely, 2^{666121452412510} is an apocalyptic number.

666121452412510 is a deficient number, since it is larger than the sum of its proper divisors (532897541775026).

666121452412510 is a wasteful number, since it uses less digits than its factorization.

666121452412510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21102507.

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 666121452412510 in words is "six hundred sixty-six trillion, one hundred twenty-one billion, four hundred fifty-two million, four hundred twelve thousand, five hundred ten".