66698157 has 16 divisors (see below), whose sum is σ = 94329792. Its totient is φ = 41775360.

The previous prime is 66698141. The next prime is 66698167. The reversal of 66698157 is 75189666.

It is not a de Polignac number, because 66698157 - 2⁴ = 66698141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66698167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47607 + ... + 48987.

It is an arithmetic number, because the mean of its divisors is an integer number (5895612).

Almost surely, 2^66698157 is an apocalyptic number.

It is an amenable number.

66698157 is a deficient number, since it is larger than the sum of its proper divisors (27631635).

66698157 is a wasteful number, since it uses less digits than its factorization.

66698157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348.

The product of its digits is 544320, while the sum is 48.

The square root of 66698157 is about 8166.8939628233. The cubic root of 66698157 is about 405.5439665113.

The spelling of 66698157 in words is "sixty-six million, six hundred ninety-eight thousand, one hundred fifty-seven".