661610063 has 8 divisors (see below), whose sum is σ = 700753680. Its totient is φ = 622491520.

The previous prime is 661610017. The next prime is 661610107. The reversal of 661610063 is 360016166.

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

It is a cyclic number.

It is not a de Polignac number, because 661610063 - 2²⁶ = 594501199 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 (661630063) 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, 94208 + ... + 100986.

It is an arithmetic number, because the mean of its divisors is an integer number (87594210).

Almost surely, 2^661610063 is an apocalyptic number.

661610063 is a deficient number, since it is larger than the sum of its proper divisors (39143617).

661610063 is a wasteful number, since it uses less digits than its factorization.

661610063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12537.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 661610063 is about 25721.7818784003. The cubic root of 661610063 is about 871.3661817979.

The spelling of 661610063 in words is "six hundred sixty-one million, six hundred ten thousand, sixty-three".