56172278389 has 2 divisors, whose sum is σ = 56172278390. Its totient is φ = 56172278388.

The previous prime is 56172278387. The next prime is 56172278413. The reversal of 56172278389 is 98387227165.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56154780900 + 17497489 = 236970^2 + 4183^2 .

It is a cyclic number.

It is not a de Polignac number, because 56172278389 - 2¹ = 56172278387 is a prime.

It is a super-2 number, since 2×56172278389² (a number of 22 digits) contains 22 as substring.

Together with 56172278387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56172278387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28086139194 + 28086139195.

It is an arithmetic number, because the mean of its divisors is an integer number (28086139195).

Almost surely, 2^56172278389 is an apocalyptic number.

It is an amenable number.

56172278389 is a deficient number, since it is larger than the sum of its proper divisors (1).

56172278389 is an equidigital number, since it uses as much as digits as its factorization.

56172278389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 58.

The spelling of 56172278389 in words is "fifty-six billion, one hundred seventy-two million, two hundred seventy-eight thousand, three hundred eighty-nine".