53666516391 has 8 divisors (see below), whose sum is σ = 71559853440. Its totient is φ = 35775428472.

The previous prime is 53666516381. The next prime is 53666516401. The reversal of 53666516391 is 19361566635.

It is an interprime number because it is at equal distance from previous prime (53666516381) and next prime (53666516401).

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

It is not a de Polignac number, because 53666516391 - 2²¹ = 53664419239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53666516381) 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, 505795 + ... + 602628.

It is an arithmetic number, because the mean of its divisors is an integer number (8944981680).

Almost surely, 2^53666516391 is an apocalyptic number.

53666516391 is a deficient number, since it is larger than the sum of its proper divisors (17893337049).

53666516391 is a wasteful number, since it uses less digits than its factorization.

53666516391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124565.

The product of its digits is 2624400, while the sum is 51.

The spelling of 53666516391 in words is "fifty-three billion, six hundred sixty-six million, five hundred sixteen thousand, three hundred ninety-one".