53147321693 has 4 divisors (see below), whose sum is σ = 53171339868. Its totient is φ = 53123303520.

The previous prime is 53147321677. The next prime is 53147321707. The reversal of 53147321693 is 39612374135.

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 46284359044 + 6862962649 = 215138^2 + 82843^2 .

It is a cyclic number.

It is not a de Polignac number, because 53147321693 - 2⁴ = 53147321677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53147321603) 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, 12005768 + ... + 12010193.

It is an arithmetic number, because the mean of its divisors is an integer number (13292834967).

Almost surely, 2^53147321693 is an apocalyptic number.

It is an amenable number.

53147321693 is a deficient number, since it is larger than the sum of its proper divisors (24018175).

53147321693 is a wasteful number, since it uses less digits than its factorization.

53147321693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24018174.

The product of its digits is 408240, while the sum is 44.

The spelling of 53147321693 in words is "fifty-three billion, one hundred forty-seven million, three hundred twenty-one thousand, six hundred ninety-three".