49609681649 has 24 divisors (see below), whose sum is σ = 55148678760. Its totient is φ = 44588712960.

The previous prime is 49609681607. The next prime is 49609681651. The reversal of 49609681649 is 94618690694.

It can be written as a sum of positive squares in 4 ways, for example, as 29825290000 + 19784391649 = 172700^2 + 140657^2 .

It is not a de Polignac number, because 49609681649 - 2¹² = 49609677553 is a prime.

It is a super-2 number, since 2×49609681649² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 49609681591 and 49609681600.

It is not an unprimeable number, because it can be changed into a prime (49609681679) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17052407 + ... + 17055315.

It is an arithmetic number, because the mean of its divisors is an integer number (2297861615).

Almost surely, 2^49609681649 is an apocalyptic number.

It is an amenable number.

49609681649 is a deficient number, since it is larger than the sum of its proper divisors (5538997111).

49609681649 is a wasteful number, since it uses less digits than its factorization.

49609681649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4481 (or 4470 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 62.

The spelling of 49609681649 in words is "forty-nine billion, six hundred nine million, six hundred eighty-one thousand, six hundred forty-nine".