561638953777 has 8 divisors (see below), whose sum is σ = 612880139232. Its totient is φ = 510428284800.

The previous prime is 561638953763. The next prime is 561638953783. The reversal of 561638953777 is 777359836165.

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 561638953777 - 2²³ = 561630565169 is a prime.

It is a super-4 number, since 4×561638953777⁴ (a number of 48 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561638993777) 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, 7590624 + ... + 7664257.

It is an arithmetic number, because the mean of its divisors is an integer number (76610017404).

Almost surely, 2^561638953777 is an apocalyptic number.

It is an amenable number.

561638953777 is a deficient number, since it is larger than the sum of its proper divisors (51241185455).

561638953777 is a wasteful number, since it uses less digits than its factorization.

561638953777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15258239.

The product of its digits is 200037600, while the sum is 67.

The spelling of 561638953777 in words is "five hundred sixty-one billion, six hundred thirty-eight million, nine hundred fifty-three thousand, seven hundred seventy-seven".