1649420557497 has 24 divisors (see below), whose sum is σ = 2389829906568. Its totient is φ = 1096232659200.

The previous prime is 1649420557469. The next prime is 1649420557501. The reversal of 1649420557497 is 7947550249461.

1649420557497 is a `hidden beast` number, since 1 + 6 + 4 + 9 + 420 + 55 + 74 + 97 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 77152839696 + 1572267717801 = 277764^2 + 1253901^2 .

It is not a de Polignac number, because 1649420557497 - 2⁸ = 1649420557241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1649420557457) 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, 5277747 + ... + 5581527.

It is an arithmetic number, because the mean of its divisors is an integer number (99576246107).

Almost surely, 2^{1649420557497} is an apocalyptic number.

It is an amenable number.

1649420557497 is a deficient number, since it is larger than the sum of its proper divisors (740409349071).

1649420557497 is a wasteful number, since it uses less digits than its factorization.

1649420557497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305641 (or 305638 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 63.

The spelling of 1649420557497 in words is "one trillion, six hundred forty-nine billion, four hundred twenty million, five hundred fifty-seven thousand, four hundred ninety-seven".