66670956157 has 8 divisors (see below), whose sum is σ = 73154199384. Its totient is φ = 60381242688.

The previous prime is 66670956151. The next prime is 66670956169. The reversal of 66670956157 is 75165907666.

It can be written as a sum of positive squares in 4 ways, for example, as 3783357081 + 62887599076 = 61509^2 + 250774^2 .

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

It is not a de Polignac number, because 66670956157 - 2²³ = 66662567549 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 (66670956151) 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, 48381718 + ... + 48383095.

It is an arithmetic number, because the mean of its divisors is an integer number (9144274923).

Almost surely, 2^66670956157 is an apocalyptic number.

It is an amenable number.

66670956157 is a deficient number, since it is larger than the sum of its proper divisors (6483243227).

66670956157 is a wasteful number, since it uses less digits than its factorization.

66670956157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96764879.

The product of its (nonzero) digits is 14288400, while the sum is 58.

The spelling of 66670956157 in words is "sixty-six billion, six hundred seventy million, nine hundred fifty-six thousand, one hundred fifty-seven".