61649467819 has 4 divisors (see below), whose sum is σ = 61655257944. Its totient is φ = 61643677696.

The previous prime is 61649467813. The next prime is 61649467823. The reversal of 61649467819 is 91876494616.

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 61649467819 - 2⁵ = 61649467787 is a prime.

It is a super-3 number, since 3×61649467819³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61649467813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2879062 + ... + 2900395.

It is an arithmetic number, because the mean of its divisors is an integer number (15413814486).

Almost surely, 2^61649467819 is an apocalyptic number.

61649467819 is a deficient number, since it is larger than the sum of its proper divisors (5790125).

61649467819 is a wasteful number, since it uses less digits than its factorization.

61649467819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5790124.

The product of its digits is 15676416, while the sum is 61.

The spelling of 61649467819 in words is "sixty-one billion, six hundred forty-nine million, four hundred sixty-seven thousand, eight hundred nineteen".