661705862 has 4 divisors (see below), whose sum is σ = 992558796. Its totient is φ = 330852930.

The previous prime is 661705853. The next prime is 661705873. The reversal of 661705862 is 268507166.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165426464 + ... + 165426467.

It is an arithmetic number, because the mean of its divisors is an integer number (248139699).

Almost surely, 2^661705862 is an apocalyptic number.

661705862 is a deficient number, since it is larger than the sum of its proper divisors (330852934).

661705862 is a wasteful number, since it uses less digits than its factorization.

661705862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330852933.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 661705862 is about 25723.6440264594. The cubic root of 661705862 is about 871.4082367710.

The spelling of 661705862 in words is "six hundred sixty-one million, seven hundred five thousand, eight hundred sixty-two".