66212317451 has 8 divisors (see below), whose sum is σ = 80122468320. Its totient is φ = 53414978688.

The previous prime is 66212317429. The next prime is 66212317489. The reversal of 66212317451 is 15471321266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66212317451 - 2²² = 66208123147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66212347451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278202896 + ... + 278203133.

It is an arithmetic number, because the mean of its divisors is an integer number (10015308540).

Almost surely, 2^66212317451 is an apocalyptic number.

66212317451 is a deficient number, since it is larger than the sum of its proper divisors (13910150869).

66212317451 is a wasteful number, since it uses less digits than its factorization.

66212317451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556406053.

The product of its digits is 60480, while the sum is 38.

The spelling of 66212317451 in words is "sixty-six billion, two hundred twelve million, three hundred seventeen thousand, four hundred fifty-one".