19701667061 has 4 divisors (see below), whose sum is σ = 19702187724. Its totient is φ = 19701146400.

The previous prime is 19701667039. The next prime is 19701667067. The reversal of 19701667061 is 16076610791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16076610791 = 3547 ⋅4532453.

It can be written as a sum of positive squares in 2 ways, for example, as 14870583025 + 4831084036 = 121945^2 + 69506^2 .

It is a cyclic number.

It is not a de Polignac number, because 19701667061 - 2²⁶ = 19634558197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19701667067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198710 + ... + 280871.

It is an arithmetic number, because the mean of its divisors is an integer number (4925546931).

Almost surely, 2^19701667061 is an apocalyptic number.

It is an amenable number.

19701667061 is a deficient number, since it is larger than the sum of its proper divisors (520663).

19701667061 is an equidigital number, since it uses as much as digits as its factorization.

19701667061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520662.

The product of its (nonzero) digits is 95256, while the sum is 44.

The spelling of 19701667061 in words is "nineteen billion, seven hundred one million, six hundred sixty-seven thousand, sixty-one".