66387957 has 16 divisors (see below), whose sum is σ = 96184320. Its totient is φ = 40575600.

The previous prime is 66387949. The next prime is 66387961. The reversal of 66387957 is 75978366.

It is not a de Polignac number, because 66387957 - 2³ = 66387949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66387917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17019 + ... + 20552.

It is an arithmetic number, because the mean of its divisors is an integer number (6011520).

Almost surely, 2^66387957 is an apocalyptic number.

It is an amenable number.

66387957 is a deficient number, since it is larger than the sum of its proper divisors (29796363).

66387957 is a wasteful number, since it uses less digits than its factorization.

66387957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37624.

The product of its digits is 1905120, while the sum is 51.

The square root of 66387957 is about 8147.8805219517. The cubic root of 66387957 is about 404.9142876076.

The spelling of 66387957 in words is "sixty-six million, three hundred eighty-seven thousand, nine hundred fifty-seven".