40047925125649 has 9 divisors (see below), whose sum is σ = 46586413411707. Its totient is φ = 34326754994784.

The previous prime is 40047925125599. The next prime is 40047925125661. The reversal of 40047925125649 is 94652152974004.

The square root of 40047925125649 is 6328343.

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., 36506452791249 + 3541472334400 = 6042057^2 + 1881880^2 .

It is not a de Polignac number, because 40047925125649 - 2¹⁹ = 40047924601361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40047925125593 and 40047925125602.

It is not an unprimeable number, because it can be changed into a prime (40047925123649) 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, 43846377 + ... + 44750425.

Almost surely, 2^{40047925125649} is an apocalyptic number.

40047925125649 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

40047925125649 is the 6328343-rd square number.

40047925125649 is the 3164172-nd centered octagonal number.

It is an amenable number.

40047925125649 is a deficient number, since it is larger than the sum of its proper divisors (6538488286058).

40047925125649 is an frugal number, since it uses more digits than its factorization.

40047925125649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808112 (or 904056 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 58.

The spelling of 40047925125649 in words is "forty trillion, forty-seven billion, nine hundred twenty-five million, one hundred twenty-five thousand, six hundred forty-nine".