63165261 has 4 divisors (see below), whose sum is σ = 84220352. Its totient is φ = 42110172.

The previous prime is 63165257. The next prime is 63165269. The reversal of 63165261 is 16256136.

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 not a de Polignac number, because 63165261 - 2² = 63165257 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 (63165269) 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, 10527541 + ... + 10527546.

It is an arithmetic number, because the mean of its divisors is an integer number (21055088).

Almost surely, 2^63165261 is an apocalyptic number.

It is an amenable number.

63165261 is a deficient number, since it is larger than the sum of its proper divisors (21055091).

63165261 is a wasteful number, since it uses less digits than its factorization.

63165261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21055090.

The product of its digits is 6480, while the sum is 30.

The square root of 63165261 is about 7947.6575794381. The cubic root of 63165261 is about 398.2533445046.

The spelling of 63165261 in words is "sixty-three million, one hundred sixty-five thousand, two hundred sixty-one".