663499541 has 4 divisors (see below), whose sum is σ = 684902784. Its totient is φ = 642096300.

The previous prime is 663499537. The next prime is 663499547. The reversal of 663499541 is 145994366.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663499541 - 2² = 663499537 is a prime.

It is a super-3 number, since 3×663499541³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663499547) 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, 10701575 + ... + 10701636.

It is an arithmetic number, because the mean of its divisors is an integer number (171225696).

Almost surely, 2^663499541 is an apocalyptic number.

It is an amenable number.

663499541 is a deficient number, since it is larger than the sum of its proper divisors (21403243).

663499541 is a wasteful number, since it uses less digits than its factorization.

663499541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21403242.

The product of its digits is 699840, while the sum is 47.

The square root of 663499541 is about 25758.4848350985. The cubic root of 663499541 is about 872.1948987277.

The spelling of 663499541 in words is "six hundred sixty-three million, four hundred ninety-nine thousand, five hundred forty-one".