828694551421 has 6 divisors (see below), whose sum is σ = 910879135166. Its totient is φ = 753358683000.

The previous prime is 828694551397. The next prime is 828694551427. The reversal of 828694551421 is 124155496828.

It can be written as a sum of positive squares in only one way, i.e., 814120025796 + 14574525625 = 902286^2 + 120725^2 .

It is not a de Polignac number, because 828694551421 - 2¹¹ = 828694549373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (828694551427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3424357530 + ... + 3424357771.

Almost surely, 2^828694551421 is an apocalyptic number.

It is an amenable number.

828694551421 is a deficient number, since it is larger than the sum of its proper divisors (82184583745).

828694551421 is a wasteful number, since it uses less digits than its factorization.

828694551421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6848715323 (or 6848715312 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 55.

The spelling of 828694551421 in words is "eight hundred twenty-eight billion, six hundred ninety-four million, five hundred fifty-one thousand, four hundred twenty-one".