72867374202661 has 4 divisors (see below), whose sum is σ = 72875619925452. Its totient is φ = 72859128479872.

The previous prime is 72867374202599. The next prime is 72867374202677. The reversal of 72867374202661 is 16620247376827.

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 38858579332225 + 34008794870436 = 6233665^2 + 5831706^2 .

It is a cyclic number.

It is not a de Polignac number, because 72867374202661 - 2⁷ = 72867374202533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72867374202661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72867374802661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4122848140 + ... + 4122865813.

It is an arithmetic number, because the mean of its divisors is an integer number (18218904981363).

Almost surely, 2^{72867374202661} is an apocalyptic number.

It is an amenable number.

72867374202661 is a deficient number, since it is larger than the sum of its proper divisors (8245722791).

72867374202661 is an equidigital number, since it uses as much as digits as its factorization.

72867374202661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8245722790.

The product of its (nonzero) digits is 56899584, while the sum is 61.

The spelling of 72867374202661 in words is "seventy-two trillion, eight hundred sixty-seven billion, three hundred seventy-four million, two hundred two thousand, six hundred sixty-one".