61653819 has 8 divisors (see below), whose sum is σ = 82256400. Its totient is φ = 41076896.

The previous prime is 61653799. The next prime is 61653821. The reversal of 61653819 is 91835616.

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 61653819 - 2⁸ = 61653563 is a prime.

It is a super-2 number, since 2×61653819² = 7602386794569522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61653419) 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, 157 + ... + 11105.

It is an arithmetic number, because the mean of its divisors is an integer number (10282050).

Almost surely, 2^61653819 is an apocalyptic number.

61653819 is a deficient number, since it is larger than the sum of its proper divisors (20602581).

61653819 is a wasteful number, since it uses less digits than its factorization.

61653819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12829.

The product of its digits is 38880, while the sum is 39.

The square root of 61653819 is about 7851.9945873644. The cubic root of 61653819 is about 395.0511475721.

The spelling of 61653819 in words is "sixty-one million, six hundred fifty-three thousand, eight hundred nineteen".