66157244 has 12 divisors (see below), whose sum is σ = 116857944. Its totient is φ = 32769264.

The previous prime is 66157241. The next prime is 66157249. The reversal of 66157244 is 44275166.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66157241) 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, 76859 + ... + 77714.

It is an arithmetic number, because the mean of its divisors is an integer number (9738162).

Almost surely, 2^66157244 is an apocalyptic number.

It is an amenable number.

66157244 is a deficient number, since it is larger than the sum of its proper divisors (50700700).

66157244 is a wasteful number, since it uses less digits than its factorization.

66157244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154684 (or 154682 counting only the distinct ones).

The product of its digits is 40320, while the sum is 35.

The square root of 66157244 is about 8133.7103464532. The cubic root of 66157244 is about 404.4446872916. Note that the first 3 decimals are identical.

The spelling of 66157244 in words is "sixty-six million, one hundred fifty-seven thousand, two hundred forty-four".