63597661 has 4 divisors (see below), whose sum is σ = 63864000. Its totient is φ = 63331324.

The previous prime is 63597649. The next prime is 63597689. The reversal of 63597661 is 16679536.

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 63597661 - 2¹⁷ = 63466589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63597631) 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, 132811 + ... + 133288.

It is an arithmetic number, because the mean of its divisors is an integer number (15966000).

Almost surely, 2^63597661 is an apocalyptic number.

It is an amenable number.

63597661 is a deficient number, since it is larger than the sum of its proper divisors (266339).

63597661 is a wasteful number, since it uses less digits than its factorization.

63597661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266338.

The product of its digits is 204120, while the sum is 43.

The square root of 63597661 is about 7974.8141671139. The cubic root of 63597661 is about 399.1600311153.

The spelling of 63597661 in words is "sixty-three million, five hundred ninety-seven thousand, six hundred sixty-one".