820641114877 has 4 divisors (see below), whose sum is σ = 822536360380. Its totient is φ = 818745869376.

The previous prime is 820641114859. The next prime is 820641114911. The reversal of 820641114877 is 778411146028.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 108745614756 + 711895500121 = 329766^2 + 843739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820641114877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 820641114877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820641114857) 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, 947622102 + ... + 947622967.

It is an arithmetic number, because the mean of its divisors is an integer number (205634090095).

Almost surely, 2^820641114877 is an apocalyptic number.

It is an amenable number.

820641114877 is a deficient number, since it is larger than the sum of its proper divisors (1895245503).

820641114877 is a wasteful number, since it uses less digits than its factorization.

820641114877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895245502.

The product of its (nonzero) digits is 602112, while the sum is 49.

The spelling of 820641114877 in words is "eight hundred twenty billion, six hundred forty-one million, one hundred fourteen thousand, eight hundred seventy-seven".