52661955391 has 16 divisors (see below), whose sum is σ = 54090806176. Its totient is φ = 51242720256.

The previous prime is 52661955389. The next prime is 52661955407. The reversal of 52661955391 is 19355916625.

It is a cyclic number.

It is not a de Polignac number, because 52661955391 - 2¹ = 52661955389 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 (52661955301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28115431 + ... + 28117303.

It is an arithmetic number, because the mean of its divisors is an integer number (3380675386).

Almost surely, 2^52661955391 is an apocalyptic number.

52661955391 is a deficient number, since it is larger than the sum of its proper divisors (1428850785).

52661955391 is a wasteful number, since it uses less digits than its factorization.

52661955391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042.

The product of its digits is 2187000, while the sum is 52.

The spelling of 52661955391 in words is "fifty-two billion, six hundred sixty-one million, nine hundred fifty-five thousand, three hundred ninety-one".