80870461821 has 6 divisors (see below), whose sum is σ = 116812889310. Its totient is φ = 53913641208.

The previous prime is 80870461817. The next prime is 80870461877. The reversal of 80870461821 is 12816407808.

80870461821 is a `hidden beast` number, since 8 + 0 + 8 + 7 + 0 + 4 + 618 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63337788900 + 17532672921 = 251670^2 + 132411^2 .

It is not a de Polignac number, because 80870461821 - 2² = 80870461817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80870461801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4492803426 + ... + 4492803443.

It is an arithmetic number, because the mean of its divisors is an integer number (19468814885).

Almost surely, 2^80870461821 is an apocalyptic number.

It is an amenable number.

80870461821 is a deficient number, since it is larger than the sum of its proper divisors (35942427489).

80870461821 is a wasteful number, since it uses less digits than its factorization.

80870461821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8985606875 (or 8985606872 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The spelling of 80870461821 in words is "eighty billion, eight hundred seventy million, four hundred sixty-one thousand, eight hundred twenty-one".