166212315011451 has 4 divisors (see below), whose sum is σ = 221616420015272. Its totient is φ = 110808210007632.

The previous prime is 166212315011383. The next prime is 166212315011453. The reversal of 166212315011451 is 154110513212661.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-166212315011451 is a prime.

It is a super-2 number, since 2×166212315011451² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166212315011453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27702052501906 + ... + 27702052501911.

It is an arithmetic number, because the mean of its divisors is an integer number (55404105003818).

Almost surely, 2^{166212315011451} is an apocalyptic number.

166212315011451 is a deficient number, since it is larger than the sum of its proper divisors (55404105003821).

166212315011451 is an equidigital number, since it uses as much as digits as its factorization.

166212315011451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55404105003820.

The product of its (nonzero) digits is 43200, while the sum is 39.

The spelling of 166212315011451 in words is "one hundred sixty-six trillion, two hundred twelve billion, three hundred fifteen million, eleven thousand, four hundred fifty-one".