675218777921 has 4 divisors (see below), whose sum is σ = 691687528644. Its totient is φ = 658750027200.

The previous prime is 675218777833. The next prime is 675218777951. The reversal of 675218777921 is 129777812576.

675218777921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147678035521 + 527540742400 = 384289^2 + 726320^2 .

It is a cyclic number.

It is not a de Polignac number, because 675218777921 - 2¹⁴ = 675218761537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (675218777951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8234375300 + ... + 8234375381.

It is an arithmetic number, because the mean of its divisors is an integer number (172921882161).

Almost surely, 2^675218777921 is an apocalyptic number.

It is an amenable number.

675218777921 is a deficient number, since it is larger than the sum of its proper divisors (16468750723).

675218777921 is a wasteful number, since it uses less digits than its factorization.

675218777921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16468750722.

The product of its digits is 20744640, while the sum is 62.

The spelling of 675218777921 in words is "six hundred seventy-five billion, two hundred eighteen million, seven hundred seventy-seven thousand, nine hundred twenty-one".