56891897693 has 2 divisors, whose sum is σ = 56891897694. Its totient is φ = 56891897692.

The previous prime is 56891897677. The next prime is 56891897719. The reversal of 56891897693 is 39679819865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51063796729 + 5828100964 = 225973^2 + 76342^2 .

It is a cyclic number.

It is not a de Polignac number, because 56891897693 - 2⁴ = 56891897677 is a prime.

It is a super-2 number, since 2×56891897693² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56891897093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28445948846 + 28445948847.

It is an arithmetic number, because the mean of its divisors is an integer number (28445948847).

Almost surely, 2^56891897693 is an apocalyptic number.

It is an amenable number.

56891897693 is a deficient number, since it is larger than the sum of its proper divisors (1).

56891897693 is an equidigital number, since it uses as much as digits as its factorization.

56891897693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176359680, while the sum is 71.

The spelling of 56891897693 in words is "fifty-six billion, eight hundred ninety-one million, eight hundred ninety-seven thousand, six hundred ninety-three".