63191661 has 16 divisors (see below), whose sum is σ = 91406784. Its totient is φ = 38600064.

The previous prime is 63191657. The next prime is 63191699. The reversal of 63191661 is 16619136.

It is not a de Polignac number, because 63191661 - 2² = 63191657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63191621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 571 + ... + 11256.

It is an arithmetic number, because the mean of its divisors is an integer number (5712924).

Almost surely, 2^63191661 is an apocalyptic number.

It is an amenable number.

63191661 is a deficient number, since it is larger than the sum of its proper divisors (28215123).

63191661 is a wasteful number, since it uses less digits than its factorization.

63191661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11980.

The product of its digits is 5832, while the sum is 33.

The square root of 63191661 is about 7949.3182726571. The cubic root of 63191661 is about 398.3088202714.

The spelling of 63191661 in words is "sixty-three million, one hundred ninety-one thousand, six hundred sixty-one".