66212011057 has 4 divisors (see below), whose sum is σ = 67200250096. Its totient is φ = 65223772020.

The previous prime is 66212011051. The next prime is 66212011067. The reversal of 66212011057 is 75011021266.

66212011057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66212011057 - 2¹⁹ = 66211486769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66212011051) 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, 494119419 + ... + 494119552.

It is an arithmetic number, because the mean of its divisors is an integer number (16800062524).

Almost surely, 2^66212011057 is an apocalyptic number.

66212011057 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

66212011057 is a deficient number, since it is larger than the sum of its proper divisors (988239039).

66212011057 is an equidigital number, since it uses as much as digits as its factorization.

66212011057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988239038.

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 66212011057 in words is "sixty-six billion, two hundred twelve million, eleven thousand, fifty-seven".