1657648663 has 16 divisors (see below), whose sum is σ = 1905679872. Its totient is φ = 1427140000.

The previous prime is 1657648661. The next prime is 1657648697. The reversal of 1657648663 is 3668467561.

It is not a de Polignac number, because 1657648663 - 2¹ = 1657648661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1657648663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1657648661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6883 + ... + 57988.

It is an arithmetic number, because the mean of its divisors is an integer number (119104992).

Almost surely, 2^1657648663 is an apocalyptic number.

1657648663 is a deficient number, since it is larger than the sum of its proper divisors (248031209).

1657648663 is a wasteful number, since it uses less digits than its factorization.

1657648663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65006.

The product of its digits is 4354560, while the sum is 52.

The square root of 1657648663 is about 40714.2317009667. The cubic root of 1657648663 is about 1183.4888279079.

The spelling of 1657648663 in words is "one billion, six hundred fifty-seven million, six hundred forty-eight thousand, six hundred sixty-three".