666515245 has 16 divisors (see below), whose sum is σ = 880258752. Its totient is φ = 480444160.

The previous prime is 666515233. The next prime is 666515249. The reversal of 666515245 is 542515666.

It is not a de Polignac number, because 666515245 - 2¹³ = 666507053 is a prime.

It is a super-3 number, since 3×666515245³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666515198 and 666515207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666515249) 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, 47407 + ... + 59836.

It is an arithmetic number, because the mean of its divisors is an integer number (55016172).

Almost surely, 2^666515245 is an apocalyptic number.

It is an amenable number.

666515245 is a deficient number, since it is larger than the sum of its proper divisors (213743507).

666515245 is a wasteful number, since it uses less digits than its factorization.

666515245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107372.

The product of its digits is 216000, while the sum is 40.

The square root of 666515245 is about 25816.9565402276. The cubic root of 666515245 is about 873.5143202232.

The spelling of 666515245 in words is "six hundred sixty-six million, five hundred fifteen thousand, two hundred forty-five".