2081780871802 has 4 divisors (see below), whose sum is σ = 3122671307706. Its totient is φ = 1040890435900.

The previous prime is 2081780871799. The next prime is 2081780871803.

2081780871802 is nontrivially palindromic in base 10.

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., 1987764434161 + 94016437641 = 1409881^2 + 306621^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2081780871802.

It is not an unprimeable number, because it can be changed into a prime (2081780871803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520445217949 + ... + 520445217952.

Almost surely, 2^{2081780871802} is an apocalyptic number.

2081780871802 is a deficient number, since it is larger than the sum of its proper divisors (1040890435904).

2081780871802 is a wasteful number, since it uses less digits than its factorization.

2081780871802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040890435903.

The product of its (nonzero) digits is 802816, while the sum is 52.

The spelling of 2081780871802 in words is "two trillion, eighty-one billion, seven hundred eighty million, eight hundred seventy-one thousand, eight hundred two".