612944828521 has 8 divisors (see below), whose sum is σ = 613663648520. Its totient is φ = 612226315008.

The previous prime is 612944828479. The next prime is 612944828537. The reversal of 612944828521 is 125828449216.

It can be written as a sum of positive squares in 4 ways, for example, as 60189752896 + 552755075625 = 245336^2 + 743475^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 612944828521 - 2¹⁹ = 612944304233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612944828921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4055335 + ... + 4203763.

It is an arithmetic number, because the mean of its divisors is an integer number (76707956065).

Almost surely, 2^612944828521 is an apocalyptic number.

It is an amenable number.

612944828521 is a deficient number, since it is larger than the sum of its proper divisors (718819999).

612944828521 is a wasteful number, since it uses less digits than its factorization.

612944828521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153243.

The product of its digits is 2211840, while the sum is 52.

The spelling of 612944828521 in words is "six hundred twelve billion, nine hundred forty-four million, eight hundred twenty-eight thousand, five hundred twenty-one".