61916663 has 4 divisors (see below), whose sum is σ = 61992360. Its totient is φ = 61840968.

The previous prime is 61916639. The next prime is 61916707. The reversal of 61916663 is 36661916.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61916663 - 2¹⁰ = 61915639 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 (61916863) 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, 36608 + ... + 38261.

It is an arithmetic number, because the mean of its divisors is an integer number (15498090).

Almost surely, 2^61916663 is an apocalyptic number.

61916663 is a deficient number, since it is larger than the sum of its proper divisors (75697).

61916663 is an equidigital number, since it uses as much as digits as its factorization.

61916663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75696.

The product of its digits is 34992, while the sum is 38.

The square root of 61916663 is about 7868.7141897517. The cubic root of 61916663 is about 395.6117487598.

The spelling of 61916663 in words is "sixty-one million, nine hundred sixteen thousand, six hundred sixty-three".