61367644843 has 4 divisors (see below), whose sum is σ = 61410771808. Its totient is φ = 61324517880.

The previous prime is 61367644801. The next prime is 61367644847. The reversal of 61367644843 is 34844676316.

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 61367644843 - 2¹⁷ = 61367513771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61367644847) 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, 21561348 + ... + 21564193.

It is an arithmetic number, because the mean of its divisors is an integer number (15352692952).

Almost surely, 2^61367644843 is an apocalyptic number.

61367644843 is a deficient number, since it is larger than the sum of its proper divisors (43126965).

61367644843 is a wasteful number, since it uses less digits than its factorization.

61367644843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43126964.

The product of its digits is 6967296, while the sum is 52.

The spelling of 61367644843 in words is "sixty-one billion, three hundred sixty-seven million, six hundred forty-four thousand, eight hundred forty-three".