66776145 has 8 divisors (see below), whose sum is σ = 106841856. Its totient is φ = 35613936.

The previous prime is 66776137. The next prime is 66776147. The reversal of 66776145 is 54167766.

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

It is not a de Polignac number, because 66776145 - 2³ = 66776137 is a prime.

It is a super-2 number, since 2×66776145² = 8918107082122050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66776097 and 66776106.

It is not an unprimeable number, because it can be changed into a prime (66776147) 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, 2225857 + ... + 2225886.

It is an arithmetic number, because the mean of its divisors is an integer number (13355232).

Almost surely, 2^66776145 is an apocalyptic number.

It is an amenable number.

66776145 is a deficient number, since it is larger than the sum of its proper divisors (40065711).

66776145 is a wasteful number, since it uses less digits than its factorization.

66776145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4451751.

The product of its digits is 211680, while the sum is 42.

The square root of 66776145 is about 8171.6672105513. The cubic root of 66776145 is about 405.7019680977.

The spelling of 66776145 in words is "sixty-six million, seven hundred seventy-six thousand, one hundred forty-five".