7855494077 has 4 divisors (see below), whose sum is σ = 7927562940. Its totient is φ = 7783425216.

The previous prime is 7855494061. The next prime is 7855494089. The reversal of 7855494077 is 7704945587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7704945587 = 1979 ⋅3893353.

It can be written as a sum of positive squares in 2 ways, for example, as 2488612996 + 5366881081 = 49886^2 + 73259^2 .

It is a cyclic number.

It is not a de Polignac number, because 7855494077 - 2⁴ = 7855494061 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 (7855494047) 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, 36034268 + ... + 36034485.

It is an arithmetic number, because the mean of its divisors is an integer number (1981890735).

Almost surely, 2^7855494077 is an apocalyptic number.

It is an amenable number.

7855494077 is a deficient number, since it is larger than the sum of its proper divisors (72068863).

7855494077 is a wasteful number, since it uses less digits than its factorization.

7855494077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72068862.

The product of its (nonzero) digits is 9878400, while the sum is 56.

The square root of 7855494077 is about 88631.2251805198. The cubic root of 7855494077 is about 1987.8845964429.

The spelling of 7855494077 in words is "seven billion, eight hundred fifty-five million, four hundred ninety-four thousand, seventy-seven".