36866442721 has 8 divisors (see below), whose sum is σ = 36974884104. Its totient is φ = 36758123520.

The previous prime is 36866442713. The next prime is 36866442761. The reversal of 36866442721 is 12724466863.

It can be written as a sum of positive squares in 4 ways, for example, as 6682245025 + 30184197696 = 81745^2 + 173736^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 36866442721 - 2³ = 36866442713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36866442761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 592341 + ... + 651613.

It is an arithmetic number, because the mean of its divisors is an integer number (4621860513).

Almost surely, 2^36866442721 is an apocalyptic number.

It is an amenable number.

36866442721 is a deficient number, since it is larger than the sum of its proper divisors (108441383).

36866442721 is a wasteful number, since it uses less digits than its factorization.

36866442721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61091.

The product of its digits is 2322432, while the sum is 49.

The spelling of 36866442721 in words is "thirty-six billion, eight hundred sixty-six million, four hundred forty-two thousand, seven hundred twenty-one".