66898151 has 4 divisors (see below), whose sum is σ = 67994904. Its totient is φ = 65801400.

The previous prime is 66898129. The next prime is 66898177. The reversal of 66898151 is 15189866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15189866 = 2 ⋅7594933.

It is a cyclic number.

It is not a de Polignac number, because 66898151 - 2¹⁸ = 66636007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66898751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548285 + ... + 548406.

It is an arithmetic number, because the mean of its divisors is an integer number (16998726).

Almost surely, 2^66898151 is an apocalyptic number.

66898151 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

66898151 is a deficient number, since it is larger than the sum of its proper divisors (1096753).

66898151 is a wasteful number, since it uses less digits than its factorization.

66898151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096752.

The product of its digits is 103680, while the sum is 44.

The square root of 66898151 is about 8179.1289878568. The cubic root of 66898151 is about 405.9489023837.

The spelling of 66898151 in words is "sixty-six million, eight hundred ninety-eight thousand, one hundred fifty-one".