53780856649 has 9 divisors (see below), whose sum is σ = 58239340263. Its totient is φ = 49641084792.

The previous prime is 53780856631. The next prime is 53780856653. The reversal of 53780856649 is 94665808735.

The square root of 53780856649 is 231907.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7955748025 + 45825108624 = 89195^2 + 214068^2 .

It is not a de Polignac number, because 53780856649 - 2¹⁷ = 53780725577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53780850649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3005872 + ... + 3023710.

It is an arithmetic number, because the mean of its divisors is an integer number (6471037807).

Almost surely, 2^53780856649 is an apocalyptic number.

53780856649 is the 231907-th square number.

53780856649 is the 115954-th centered octagonal number.

It is an amenable number.

53780856649 is a deficient number, since it is larger than the sum of its proper divisors (4458483614).

53780856649 is an frugal number, since it uses more digits than its factorization.

53780856649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35704 (or 17852 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 61.

The spelling of 53780856649 in words is "fifty-three billion, seven hundred eighty million, eight hundred fifty-six thousand, six hundred forty-nine".