670695961 has 4 divisors (see below), whose sum is σ = 722287972. Its totient is φ = 619103952.

The previous prime is 670695959. The next prime is 670695997. The reversal of 670695961 is 169596076.

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 247118400 + 423577561 = 15720^2 + 20581^2 .

It is a cyclic number.

It is not a de Polignac number, because 670695961 - 2¹ = 670695959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670695161) 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, 25795986 + ... + 25796011.

It is an arithmetic number, because the mean of its divisors is an integer number (180571993).

Almost surely, 2^670695961 is an apocalyptic number.

It is an amenable number.

670695961 is a deficient number, since it is larger than the sum of its proper divisors (51592011).

670695961 is a wasteful number, since it uses less digits than its factorization.

670695961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51592010.

The product of its (nonzero) digits is 612360, while the sum is 49.

The square root of 670695961 is about 25897.7983813296. The cubic root of 670695961 is about 875.3368873110.

The spelling of 670695961 in words is "six hundred seventy million, six hundred ninety-five thousand, nine hundred sixty-one".