87821453697 has 4 divisors (see below), whose sum is σ = 117095271600. Its totient is φ = 58547635796.

The previous prime is 87821453663. The next prime is 87821453729. The reversal of 87821453697 is 79635412878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87821453697 - 2¹¹ = 87821451649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87821453697.

It is not an unprimeable number, because it can be changed into a prime (87821453617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14636908947 + ... + 14636908952.

It is an arithmetic number, because the mean of its divisors is an integer number (29273817900).

Almost surely, 2^87821453697 is an apocalyptic number.

It is an amenable number.

87821453697 is a deficient number, since it is larger than the sum of its proper divisors (29273817903).

87821453697 is a wasteful number, since it uses less digits than its factorization.

87821453697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29273817902.

The product of its digits is 20321280, while the sum is 60.

The spelling of 87821453697 in words is "eighty-seven billion, eight hundred twenty-one million, four hundred fifty-three thousand, six hundred ninety-seven".