36381687772561 has 4 divisors (see below), whose sum is σ = 36381791673072. Its totient is φ = 36381583872052.

The previous prime is 36381687772519. The next prime is 36381687772589. The reversal of 36381687772561 is 16527778618363.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 36381687772561 - 2³⁹ = 35831931958673 is a prime.

It is a super-2 number, since 2×36381687772561² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36381687772061) 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, 51423235 + ... + 52125928.

It is an arithmetic number, because the mean of its divisors is an integer number (9095447918268).

Almost surely, 2^{36381687772561} is an apocalyptic number.

It is an amenable number.

36381687772561 is a deficient number, since it is larger than the sum of its proper divisors (103900511).

36381687772561 is a wasteful number, since it uses less digits than its factorization.

36381687772561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103900510.

The product of its digits is 426746880, while the sum is 70.

The spelling of 36381687772561 in words is "thirty-six trillion, three hundred eighty-one billion, six hundred eighty-seven million, seven hundred seventy-two thousand, five hundred sixty-one".