66124126157 has 4 divisors (see below), whose sum is σ = 66335385660. Its totient is φ = 65912866656.

The previous prime is 66124126151. The next prime is 66124126163. The reversal of 66124126157 is 75162142166.

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

It is an interprime number because it is at equal distance from previous prime (66124126151) and next prime (66124126163).

It can be written as a sum of positive squares in 2 ways, for example, as 2607021481 + 63517104676 = 51059^2 + 252026^2 .

It is a cyclic number.

It is not a de Polignac number, because 66124126157 - 2⁴ = 66124126141 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 (66124126151) 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, 105629282 + ... + 105629907.

It is an arithmetic number, because the mean of its divisors is an integer number (16583846415).

Almost surely, 2^66124126157 is an apocalyptic number.

It is an amenable number.

66124126157 is a deficient number, since it is larger than the sum of its proper divisors (211259503).

66124126157 is a wasteful number, since it uses less digits than its factorization.

66124126157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211259502.

The product of its digits is 120960, while the sum is 41.

The spelling of 66124126157 in words is "sixty-six billion, one hundred twenty-four million, one hundred twenty-six thousand, one hundred fifty-seven".