36561573621776 has 80 divisors (see below), whose sum is σ = 81843113324544. Its totient is φ = 15498258878592.

The previous prime is 36561573621757. The next prime is 36561573621809. The reversal of 36561573621776 is 67712637516563.

It is a happy number.

It is a super-2 number, since 2×36561573621776² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7568645 + ... + 11419611.

Almost surely, 2^{36561573621776} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 36561573621776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40921556662272).

36561573621776 is an abundant number, since it is smaller than the sum of its proper divisors (45281539702768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

36561573621776 is a wasteful number, since it uses less digits than its factorization.

36561573621776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3851908 (or 3851902 counting only the distinct ones).

The product of its digits is 200037600, while the sum is 65.

The spelling of 36561573621776 in words is "thirty-six trillion, five hundred sixty-one billion, five hundred seventy-three million, six hundred twenty-one thousand, seven hundred seventy-six".