53957780729 has 4 divisors (see below), whose sum is σ = 53958282084. Its totient is φ = 53957279376.

The previous prime is 53957780707. The next prime is 53957780771. The reversal of 53957780729 is 92708775935.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 41575210000 + 12382570729 = 203900^2 + 111277^2 .

It is a cyclic number.

It is not a de Polignac number, because 53957780729 - 2⁸ = 53957780473 is a prime.

It is a super-2 number, since 2×53957780729² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53957780029) 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, 16022 + ... + 328895.

It is an arithmetic number, because the mean of its divisors is an integer number (13489570521).

Almost surely, 2^53957780729 is an apocalyptic number.

It is an amenable number.

53957780729 is a deficient number, since it is larger than the sum of its proper divisors (501355).

53957780729 is a wasteful number, since it uses less digits than its factorization.

53957780729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501354.

The product of its (nonzero) digits is 33339600, while the sum is 62.

The spelling of 53957780729 in words is "fifty-three billion, nine hundred fifty-seven million, seven hundred eighty thousand, seven hundred twenty-nine".