561672778387 has 6 divisors (see below), whose sum is σ = 653374456548. Its totient is φ = 481433810004.

The previous prime is 561672778367. The next prime is 561672778427. The reversal of 561672778387 is 783877276165.

It is a de Polignac number, because none of the positive numbers 2^k-561672778387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561672778367) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5731354833 + ... + 5731354930.

It is an arithmetic number, because the mean of its divisors is an integer number (108895742758).

Almost surely, 2^561672778387 is an apocalyptic number.

561672778387 is a deficient number, since it is larger than the sum of its proper divisors (91701678161).

561672778387 is a wasteful number, since it uses less digits than its factorization.

561672778387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11462709777 (or 11462709770 counting only the distinct ones).

The product of its digits is 165957120, while the sum is 67.

The spelling of 561672778387 in words is "five hundred sixty-one billion, six hundred seventy-two million, seven hundred seventy-eight thousand, three hundred eighty-seven".