66071204225 has 24 divisors (see below), whose sum is σ = 93420505080. Its totient is φ = 45920977920.

The previous prime is 66071204189. The next prime is 66071204237. The reversal of 66071204225 is 52240217066.

It can be written as a sum of positive squares in 12 ways, for example, as 9470987761 + 56600216464 = 97319^2 + 237908^2 .

It is not a de Polignac number, because 66071204225 - 2⁶ = 66071204161 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5973770 + ... + 5984819.

It is an arithmetic number, because the mean of its divisors is an integer number (3892521045).

Almost surely, 2^66071204225 is an apocalyptic number.

66071204225 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66071204225 is a deficient number, since it is larger than the sum of its proper divisors (27349300855).

66071204225 is a wasteful number, since it uses less digits than its factorization.

66071204225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11958629 (or 11958624 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 66071204225 in words is "sixty-six billion, seventy-one million, two hundred four thousand, two hundred twenty-five".