66460602646021 has 4 divisors (see below), whose sum is σ = 66738680481600. Its totient is φ = 66182524810444.

The previous prime is 66460602645967. The next prime is 66460602646033. The reversal of 66460602646021 is 12064620606466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66460602646021 - 2³¹ = 66458455162373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66464602646021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139038917431 + ... + 139038917908.

It is an arithmetic number, because the mean of its divisors is an integer number (16684670120400).

Almost surely, 2^{66460602646021} is an apocalyptic number.

It is an amenable number.

66460602646021 is a deficient number, since it is larger than the sum of its proper divisors (278077835579).

66460602646021 is a wasteful number, since it uses less digits than its factorization.

66460602646021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278077835578.

The product of its (nonzero) digits is 2985984, while the sum is 49.

The spelling of 66460602646021 in words is "sixty-six trillion, four hundred sixty billion, six hundred two million, six hundred forty-six thousand, twenty-one".