53660652781 has 8 divisors (see below), whose sum is σ = 55182264984. Its totient is φ = 52142794560.

The previous prime is 53660652767. The next prime is 53660652797. The reversal of 53660652781 is 18725606635.

It can be written as a sum of positive squares in 4 ways, for example, as 1828845225 + 51831807556 = 42765^2 + 227666^2 .

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 53660652781 - 2⁷ = 53660652653 is a prime.

It is a super-2 number, since 2×53660652781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53660652761) 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, 909490 + ... + 966691.

It is an arithmetic number, because the mean of its divisors is an integer number (6897783123).

Almost surely, 2^53660652781 is an apocalyptic number.

It is an amenable number.

53660652781 is a deficient number, since it is larger than the sum of its proper divisors (1521612203).

53660652781 is a wasteful number, since it uses less digits than its factorization.

53660652781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876991.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 53660652781 in words is "fifty-three billion, six hundred sixty million, six hundred fifty-two thousand, seven hundred eighty-one".