66156951 has 8 divisors (see below), whose sum is σ = 100810624. Its totient is φ = 37803960.

The previous prime is 66156943. The next prime is 66156971. The reversal of 66156951 is 15965166.

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

It is not a de Polignac number, because 66156951 - 2³ = 66156943 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 (66156941) 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 7 ways as a sum of consecutive naturals, for example, 1575145 + ... + 1575186.

It is an arithmetic number, because the mean of its divisors is an integer number (12601328).

Almost surely, 2^66156951 is an apocalyptic number.

66156951 is a deficient number, since it is larger than the sum of its proper divisors (34653673).

66156951 is a wasteful number, since it uses less digits than its factorization.

66156951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3150341.

The product of its digits is 48600, while the sum is 39.

The square root of 66156951 is about 8133.6923349731. The cubic root of 66156951 is about 404.4440902168. Note that the first 3 decimals are identical.

The spelling of 66156951 in words is "sixty-six million, one hundred fifty-six thousand, nine hundred fifty-one".