661502707 has 4 divisors (see below), whose sum is σ = 682841536. Its totient is φ = 640163880.

The previous prime is 661502587. The next prime is 661502717. The reversal of 661502707 is 707205166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661502707 - 2¹⁹ = 660978419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661502717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10669368 + ... + 10669429.

It is an arithmetic number, because the mean of its divisors is an integer number (170710384).

Almost surely, 2^661502707 is an apocalyptic number.

661502707 is a deficient number, since it is larger than the sum of its proper divisors (21338829).

661502707 is a wasteful number, since it uses less digits than its factorization.

661502707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21338828.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 661502707 is about 25719.6949243182. The cubic root of 661502707 is about 871.3190485728.

The spelling of 661502707 in words is "six hundred sixty-one million, five hundred two thousand, seven hundred seven".