1663954426 has 8 divisors (see below), whose sum is σ = 2504814804. Its totient is φ = 829016160.

The previous prime is 1663954387. The next prime is 1663954427. The reversal of 1663954426 is 6244593661.

It can be written as a sum of positive squares in 2 ways, for example, as 1615638025 + 48316401 = 40195^2 + 6951^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1663954427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1479825 + ... + 1480948.

Almost surely, 2^1663954426 is an apocalyptic number.

1663954426 is a deficient number, since it is larger than the sum of its proper divisors (840860378).

1663954426 is a wasteful number, since it uses less digits than its factorization.

1663954426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2961056.

The product of its digits is 933120, while the sum is 46.

The square root of 1663954426 is about 40791.5974926210. The cubic root of 1663954426 is about 1184.9876089312.

The spelling of 1663954426 in words is "one billion, six hundred sixty-three million, nine hundred fifty-four thousand, four hundred twenty-six".