20177211455 has 4 divisors (see below), whose sum is σ = 24212653752. Its totient is φ = 16141769160.

The previous prime is 20177211451. The next prime is 20177211493. The reversal of 20177211455 is 55411277102.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20177211455 - 2² = 20177211451 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 (20177211451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2017721141 + ... + 2017721150.

It is an arithmetic number, because the mean of its divisors is an integer number (6053163438).

Almost surely, 2^20177211455 is an apocalyptic number.

20177211455 is a deficient number, since it is larger than the sum of its proper divisors (4035442297).

20177211455 is an equidigital number, since it uses as much as digits as its factorization.

20177211455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4035442296.

The product of its (nonzero) digits is 19600, while the sum is 35.

Adding to 20177211455 its reverse (55411277102), we get a palindrome (75588488557).

The spelling of 20177211455 in words is "twenty billion, one hundred seventy-seven million, two hundred eleven thousand, four hundred fifty-five".