20616546601 has 6 divisors (see below), whose sum is σ = 23982513450. Its totient is φ = 17671325616.

The previous prime is 20616546583. The next prime is 20616546607. The reversal of 20616546601 is 10664561602.

It can be written as a sum of positive squares in only one way, i.e., 20128799376 + 487747225 = 141876^2 + 22085^2 .

It is not a de Polignac number, because 20616546601 - 2⁷ = 20616546473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20616546607) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 210372876 + ... + 210372973.

It is an arithmetic number, because the mean of its divisors is an integer number (3997085575).

Almost surely, 2^20616546601 is an apocalyptic number.

It is an amenable number.

20616546601 is a deficient number, since it is larger than the sum of its proper divisors (3365966849).

20616546601 is an equidigital number, since it uses as much as digits as its factorization.

20616546601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420745863 (or 420745856 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 20616546601 in words is "twenty billion, six hundred sixteen million, five hundred forty-six thousand, six hundred one".