163636551461 has 4 divisors (see below), whose sum is σ = 164734783500. Its totient is φ = 162538319424.

The previous prime is 163636551409. The next prime is 163636551467. The reversal of 163636551461 is 164155636361.

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 76124120836 + 87512430625 = 275906^2 + 295825^2 .

It is a cyclic number.

It is not a de Polignac number, because 163636551461 - 2²² = 163632357157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163636551467) 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, 549115796 + ... + 549116093.

It is an arithmetic number, because the mean of its divisors is an integer number (41183695875).

Almost surely, 2^163636551461 is an apocalyptic number.

It is an amenable number.

163636551461 is a deficient number, since it is larger than the sum of its proper divisors (1098232039).

163636551461 is a wasteful number, since it uses less digits than its factorization.

163636551461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098232038.

The product of its digits is 1166400, while the sum is 47.

The spelling of 163636551461 in words is "one hundred sixty-three billion, six hundred thirty-six million, five hundred fifty-one thousand, four hundred sixty-one".