66460371021 has 32 divisors (see below), whose sum is σ = 107426150400. Its totient is φ = 40273219440.

The previous prime is 66460371011. The next prime is 66460371023. The reversal of 66460371021 is 12017306466.

It is a happy number.

66460371021 is a `hidden beast` number, since 6 + 646 + 0 + 3 + 7 + 1 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 66460371021 - 2¹⁵ = 66460338253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66460371023) 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 31 ways as a sum of consecutive naturals, for example, 3006210 + ... + 3028236.

It is an arithmetic number, because the mean of its divisors is an integer number (3357067200).

Almost surely, 2^66460371021 is an apocalyptic number.

It is an amenable number.

66460371021 is a deficient number, since it is larger than the sum of its proper divisors (40965779379).

66460371021 is a wasteful number, since it uses less digits than its factorization.

66460371021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32206 (or 32200 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

Adding to 66460371021 its reverse (12017306466), we get a palindrome (78477677487).

The spelling of 66460371021 in words is "sixty-six billion, four hundred sixty million, three hundred seventy-one thousand, twenty-one".