36801658561 has 4 divisors (see below), whose sum is σ = 38070681300. Its totient is φ = 35532635824.

The previous prime is 36801658559. The next prime is 36801658573. The reversal of 36801658561 is 16585610863.

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 15825640000 + 20976018561 = 125800^2 + 144831^2 .

It is a cyclic number.

It is not a de Polignac number, because 36801658561 - 2¹ = 36801658559 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36801658511) 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, 634511326 + ... + 634511383.

It is an arithmetic number, because the mean of its divisors is an integer number (9517670325).

Almost surely, 2^36801658561 is an apocalyptic number.

It is an amenable number.

36801658561 is a deficient number, since it is larger than the sum of its proper divisors (1269022739).

36801658561 is a wasteful number, since it uses less digits than its factorization.

36801658561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269022738.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 36801658561 in words is "thirty-six billion, eight hundred one million, six hundred fifty-eight thousand, five hundred sixty-one".