666765745 has 16 divisors (see below), whose sum is σ = 835604352. Its totient is φ = 509794560.

The previous prime is 666765733. The next prime is 666765761. The reversal of 666765745 is 547567666.

It is not a de Polignac number, because 666765745 - 2¹⁷ = 666634673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666765692 and 666765701.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247174 + ... + 249856.

It is an arithmetic number, because the mean of its divisors is an integer number (52225272).

Almost surely, 2^666765745 is an apocalyptic number.

It is an amenable number.

666765745 is a deficient number, since it is larger than the sum of its proper divisors (168838607).

666765745 is a wasteful number, since it uses less digits than its factorization.

666765745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4872.

The product of its digits is 6350400, while the sum is 52.

The square root of 666765745 is about 25821.8075471103. The cubic root of 666765745 is about 873.6237390408.

The spelling of 666765745 in words is "six hundred sixty-six million, seven hundred sixty-five thousand, seven hundred forty-five".