1649487657 has 8 divisors (see below), whose sum is σ = 2200050400. Its totient is φ = 1099291680.

The previous prime is 1649487643. The next prime is 1649487659. The reversal of 1649487657 is 7567849461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1649487657 - 2¹¹ = 1649485609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1649487597 and 1649487606.

It is not an unprimeable number, because it can be changed into a prime (1649487659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81019 + ... + 99312.

It is an arithmetic number, because the mean of its divisors is an integer number (275006300).

Almost surely, 2^1649487657 is an apocalyptic number.

It is an amenable number.

1649487657 is a deficient number, since it is larger than the sum of its proper divisors (550562743).

1649487657 is a wasteful number, since it uses less digits than its factorization.

1649487657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183383.

The product of its digits is 10160640, while the sum is 57.

The square root of 1649487657 is about 40613.8850271677. The cubic root of 1649487657 is about 1181.5434311040.

The spelling of 1649487657 in words is "one billion, six hundred forty-nine million, four hundred eighty-seven thousand, six hundred fifty-seven".