647663541 has 8 divisors (see below), whose sum is σ = 986915904. Its totient is φ = 370093440.

The previous prime is 647663539. The next prime is 647663543. The reversal of 647663541 is 145366746.

It is an interprime number because it is at equal distance from previous prime (647663539) and next prime (647663543).

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

It is not a de Polignac number, because 647663541 - 2¹ = 647663539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647663493 and 647663502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647663543) 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 7 ways as a sum of consecutive naturals, for example, 15420540 + ... + 15420581.

It is an arithmetic number, because the mean of its divisors is an integer number (123364488).

Almost surely, 2^647663541 is an apocalyptic number.

It is an amenable number.

647663541 is a deficient number, since it is larger than the sum of its proper divisors (339252363).

647663541 is a wasteful number, since it uses less digits than its factorization.

647663541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30841131.

The product of its digits is 362880, while the sum is 42.

The square root of 647663541 is about 25449.2345857395. The cubic root of 647663541 is about 865.1999453145.

The spelling of 647663541 in words is "six hundred forty-seven million, six hundred sixty-three thousand, five hundred forty-one".