2143555772905 has 8 divisors (see below), whose sum is σ = 2576435921352. Its totient is φ = 1712065289088.

The previous prime is 2143555772899. The next prime is 2143555772923. The reversal of 2143555772905 is 5092775553412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20931144976 + 2122624627929 = 144676^2 + 1456923^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2143555772905 - 2⁵ = 2143555772873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347412762 + ... + 347418931.

It is an arithmetic number, because the mean of its divisors is an integer number (322054490169).

Almost surely, 2^{2143555772905} is an apocalyptic number.

It is an amenable number.

2143555772905 is a deficient number, since it is larger than the sum of its proper divisors (432880148447).

2143555772905 is an equidigital number, since it uses as much as digits as its factorization.

2143555772905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694832315.

The product of its (nonzero) digits is 13230000, while the sum is 55.

The spelling of 2143555772905 in words is "two trillion, one hundred forty-three billion, five hundred fifty-five million, seven hundred seventy-two thousand, nine hundred five".