8156940877829 has 4 divisors (see below), whose sum is σ = 8636760929484. Its totient is φ = 7677120826176.

The previous prime is 8156940877807. The next prime is 8156940877847. The reversal of 8156940877829 is 9287780496518.

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 7561262550625 + 595678327204 = 2749775^2 + 771802^2 .

It is a cyclic number.

It is not a de Polignac number, because 8156940877829 - 2¹² = 8156940873733 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 (8156940877859) 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, 239910025802 + ... + 239910025835.

It is an arithmetic number, because the mean of its divisors is an integer number (2159190232371).

Almost surely, 2^{8156940877829} is an apocalyptic number.

It is an amenable number.

8156940877829 is a deficient number, since it is larger than the sum of its proper divisors (479820051655).

8156940877829 is a wasteful number, since it uses less digits than its factorization.

8156940877829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479820051654.

The product of its (nonzero) digits is 487710720, while the sum is 74.

The spelling of 8156940877829 in words is "eight trillion, one hundred fifty-six billion, nine hundred forty million, eight hundred seventy-seven thousand, eight hundred twenty-nine".