771132638842 has 4 divisors (see below), whose sum is σ = 1156698958266. Its totient is φ = 385566319420.

The previous prime is 771132638831. The next prime is 771132638849. The reversal of 771132638842 is 248836231177.

771132638842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 724151642841 + 46980996001 = 850971^2 + 216751^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 771132638842.

It is not an unprimeable number, because it can be changed into a prime (771132638849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192783159709 + ... + 192783159712.

Almost surely, 2^771132638842 is an apocalyptic number.

771132638842 is a deficient number, since it is larger than the sum of its proper divisors (385566319424).

771132638842 is a wasteful number, since it uses less digits than its factorization.

771132638842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385566319423.

The product of its digits is 2709504, while the sum is 52.

The spelling of 771132638842 in words is "seven hundred seventy-one billion, one hundred thirty-two million, six hundred thirty-eight thousand, eight hundred forty-two".