36991952821 has 4 divisors (see below), whose sum is σ = 36995658700. Its totient is φ = 36988246944.

The previous prime is 36991952801. The next prime is 36991952887. The reversal of 36991952821 is 12825919963.

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 30350517796 + 6641435025 = 174214^2 + 81495^2 .

It is a cyclic number.

It is not a de Polignac number, because 36991952821 - 2⁷ = 36991952693 is a prime.

It is a super-2 number, since 2×36991952821² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36991952801) 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, 1837926 + ... + 1857943.

It is an arithmetic number, because the mean of its divisors is an integer number (9248914675).

Almost surely, 2^36991952821 is an apocalyptic number.

It is an amenable number.

36991952821 is a deficient number, since it is larger than the sum of its proper divisors (3705879).

36991952821 is a wasteful number, since it uses less digits than its factorization.

36991952821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3705878.

The product of its digits is 2099520, while the sum is 55.

It can be divided in two parts, 369919 and 52821, that added together give a triangular number (422740 = T₉₁₉).

The spelling of 36991952821 in words is "thirty-six billion, nine hundred ninety-one million, nine hundred fifty-two thousand, eight hundred twenty-one".