1721487663 has 48 divisors (see below), whose sum is σ = 2902348800. Its totient is φ = 962902080.

The previous prime is 1721487619. The next prime is 1721487683. The reversal of 1721487663 is 3667841271.

It is not a de Polignac number, because 1721487663 - 2⁸ = 1721487407 is a prime.

It is a super-2 number, since 2×1721487663² = 5927039547722403138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721487613) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1006453 + ... + 1008161.

It is an arithmetic number, because the mean of its divisors is an integer number (60465600).

Almost surely, 2^1721487663 is an apocalyptic number.

1721487663 is a deficient number, since it is larger than the sum of its proper divisors (1180861137).

1721487663 is a wasteful number, since it uses less digits than its factorization.

1721487663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052 (or 2049 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 1721487663 is about 41490.8142002540. The cubic root of 1721487663 is about 1198.4906168481.

The spelling of 1721487663 in words is "one billion, seven hundred twenty-one million, four hundred eighty-seven thousand, six hundred sixty-three".