61221205783 has 8 divisors (see below), whose sum is σ = 64825202880. Its totient is φ = 57617514240.

The previous prime is 61221205733. The next prime is 61221205807. The reversal of 61221205783 is 38750212216.

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 61221205783 - 2²⁵ = 61187651351 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 (61221205733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433378 + ... + 557008.

It is an arithmetic number, because the mean of its divisors is an integer number (8103150360).

Almost surely, 2^61221205783 is an apocalyptic number.

61221205783 is a deficient number, since it is larger than the sum of its proper divisors (3603997097).

61221205783 is a wasteful number, since it uses less digits than its factorization.

61221205783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152777.

The product of its (nonzero) digits is 40320, while the sum is 37.

Adding to 61221205783 its reverse (38750212216), we get a palindrome (99971417999).

The spelling of 61221205783 in words is "sixty-one billion, two hundred twenty-one million, two hundred five thousand, seven hundred eighty-three".