662709961 has 4 divisors (see below), whose sum is σ = 666371524. Its totient is φ = 659048400.

The previous prime is 662709959. The next prime is 662709973. The reversal of 662709961 is 169907266.

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

It can be written as a sum of positive squares in 2 ways, for example, as 176066361 + 486643600 = 13269^2 + 22060^2 .

It is a cyclic number.

It is not a de Polignac number, because 662709961 - 2¹ = 662709959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (662709161) 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, 1830510 + ... + 1830871.

It is an arithmetic number, because the mean of its divisors is an integer number (166592881).

Almost surely, 2^662709961 is an apocalyptic number.

It is an amenable number.

662709961 is a deficient number, since it is larger than the sum of its proper divisors (3661563).

662709961 is a wasteful number, since it uses less digits than its factorization.

662709961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661562.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 662709961 is about 25743.1536723844. The cubic root of 662709961 is about 871.8487839413.

The spelling of 662709961 in words is "six hundred sixty-two million, seven hundred nine thousand, nine hundred sixty-one".