56786156621 has 2 divisors, whose sum is σ = 56786156622. Its totient is φ = 56786156620.

The previous prime is 56786156617. The next prime is 56786156677. The reversal of 56786156621 is 12665168765.

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., 56424776521 + 361380100 = 237539^2 + 19010^2 .

It is a cyclic number.

It is not a de Polignac number, because 56786156621 - 2² = 56786156617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56786156821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28393078310 + 28393078311.

It is an arithmetic number, because the mean of its divisors is an integer number (28393078311).

Almost surely, 2^56786156621 is an apocalyptic number.

It is an amenable number.

56786156621 is a deficient number, since it is larger than the sum of its proper divisors (1).

56786156621 is an equidigital number, since it uses as much as digits as its factorization.

56786156621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 53.

The spelling of 56786156621 in words is "fifty-six billion, seven hundred eighty-six million, one hundred fifty-six thousand, six hundred twenty-one".