661006015 has 16 divisors (see below), whose sum is σ = 802775232. Its totient is φ = 522445824.

The previous prime is 661006013. The next prime is 661006033. The reversal of 661006015 is 510600166.

It is a cyclic number.

It is not a de Polignac number, because 661006015 - 2¹ = 661006013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661006013) 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, 482862 + ... + 484228.

It is an arithmetic number, because the mean of its divisors is an integer number (50173452).

Almost surely, 2^661006015 is an apocalyptic number.

661006015 is a deficient number, since it is larger than the sum of its proper divisors (141769217).

661006015 is a wasteful number, since it uses less digits than its factorization.

661006015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 661006015 is about 25710.0372422912. The cubic root of 661006015 is about 871.1009161505.

The spelling of 661006015 in words is "six hundred sixty-one million, six thousand, fifteen".