561672778397 has 8 divisors (see below), whose sum is σ = 563730874200. Its totient is φ = 559614901824.

The previous prime is 561672778367. The next prime is 561672778427. The reversal of 561672778397 is 793877276165.

It is an interprime number because it is at equal distance from previous prime (561672778367) and next prime (561672778427).

It can be written as a sum of positive squares in 4 ways, for example, as 9543531481 + 552129246916 = 97691^2 + 743054^2 .

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 561672778397 - 2⁶ = 561672778333 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 (561672778367) 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 7 ways as a sum of consecutive naturals, for example, 6513479 + ... + 6599147.

It is an arithmetic number, because the mean of its divisors is an integer number (70466359275).

Almost surely, 2^561672778397 is an apocalyptic number.

It is an amenable number.

561672778397 is a deficient number, since it is larger than the sum of its proper divisors (2058095803).

561672778397 is a wasteful number, since it uses less digits than its factorization.

561672778397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109615.

The product of its digits is 186701760, while the sum is 68.

The spelling of 561672778397 in words is "five hundred sixty-one billion, six hundred seventy-two million, seven hundred seventy-eight thousand, three hundred ninety-seven".