20165606601 has 32 divisors (see below), whose sum is σ = 33021757440. Its totient is φ = 10683484416.

The previous prime is 20165606599. The next prime is 20165606611. The reversal of 20165606601 is 10660656102.

It is not a de Polignac number, because 20165606601 - 2¹ = 20165606599 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20165606611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 397621 + ... + 445458.

It is an arithmetic number, because the mean of its divisors is an integer number (1031929920).

Almost surely, 2^20165606601 is an apocalyptic number.

20165606601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20165606601 is a deficient number, since it is larger than the sum of its proper divisors (12856150839).

20165606601 is a wasteful number, since it uses less digits than its factorization.

20165606601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843173.

The product of its (nonzero) digits is 12960, while the sum is 33.

The spelling of 20165606601 in words is "twenty billion, one hundred sixty-five million, six hundred six thousand, six hundred one".