2156454777793 has 4 divisors (see below), whose sum is σ = 2156462242480. Its totient is φ = 2156447313108.

The previous prime is 2156454777779. The next prime is 2156454777797. The reversal of 2156454777793 is 3977774546512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2156454777793 - 2³⁷ = 2019015824321 is a prime.

It is a super-4 number, since 4×2156454777793⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156454777797) 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, 3280803 + ... + 3882856.

It is an arithmetic number, because the mean of its divisors is an integer number (539115560620).

Almost surely, 2^{2156454777793} is an apocalyptic number.

It is an amenable number.

2156454777793 is a deficient number, since it is larger than the sum of its proper divisors (7464687).

2156454777793 is an equidigital number, since it uses as much as digits as its factorization.

2156454777793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7464686.

The product of its digits is 311169600, while the sum is 67.

The spelling of 2156454777793 in words is "two trillion, one hundred fifty-six billion, four hundred fifty-four million, seven hundred seventy-seven thousand, seven hundred ninety-three".