63501661 has 8 divisors (see below), whose sum is σ = 65346624. Its totient is φ = 61670880.

The previous prime is 63501649. The next prime is 63501673. The reversal of 63501661 is 16610536.

It is an interprime number because it is at equal distance from previous prime (63501649) and next prime (63501673).

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

It is a cyclic number.

It is not a de Polignac number, because 63501661 - 2¹¹ = 63499613 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 (63501161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5896 + ... + 12718.

It is an arithmetic number, because the mean of its divisors is an integer number (8168328).

Almost surely, 2^63501661 is an apocalyptic number.

It is an amenable number.

63501661 is a deficient number, since it is larger than the sum of its proper divisors (1844963).

63501661 is a wasteful number, since it uses less digits than its factorization.

63501661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7091.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 63501661 is about 7968.7929449823. The cubic root of 63501661 is about 398.9590873518.

The spelling of 63501661 in words is "sixty-three million, five hundred one thousand, six hundred sixty-one".