561672778403 has 8 divisors (see below), whose sum is σ = 615175114176. Its totient is φ = 508577305000.

The previous prime is 561672778367. The next prime is 561672778427. The reversal of 561672778403 is 304877276165.

It is a happy number.

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 561672778403 - 2³⁶ = 492953301667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561672778463) 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, 101712701 + ... + 101718222.

It is an arithmetic number, because the mean of its divisors is an integer number (76896889272).

Almost surely, 2^561672778403 is an apocalyptic number.

561672778403 is a deficient number, since it is larger than the sum of its proper divisors (53502335773).

561672778403 is a wasteful number, since it uses less digits than its factorization.

561672778403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203431185.

The product of its (nonzero) digits is 11854080, while the sum is 56.

The spelling of 561672778403 in words is "five hundred sixty-one billion, six hundred seventy-two million, seven hundred seventy-eight thousand, four hundred three".