66540377 has 4 divisors (see below), whose sum is σ = 67668240. Its totient is φ = 65412516.

The previous prime is 66540367. The next prime is 66540379. The reversal of 66540377 is 77304566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66540377 - 2¹⁰ = 66539353 is a prime.

It is a super-3 number, since 3×66540377³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66540377.

It is not an unprimeable number, because it can be changed into a prime (66540379) 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, 563843 + ... + 563960.

It is an arithmetic number, because the mean of its divisors is an integer number (16917060).

Almost surely, 2^66540377 is an apocalyptic number.

It is an amenable number.

66540377 is a deficient number, since it is larger than the sum of its proper divisors (1127863).

66540377 is a wasteful number, since it uses less digits than its factorization.

66540377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127862.

The product of its (nonzero) digits is 105840, while the sum is 38.

The square root of 66540377 is about 8157.2285121848. The cubic root of 66540377 is about 405.2239314378.

The spelling of 66540377 in words is "sixty-six million, five hundred forty thousand, three hundred seventy-seven".